For what purpose does the author of why leaves turn color in the fall organize the essay according to cause and effect?
Why does the author of “Why Leaves Turn Color in the Fall” organize the essay according to cause and effect? She wants to describe how cold weather affects nature. She wants to explain the process by which the color green disappears from leaves. She wants to explain the scientific process called photosynthesis.
Why is fall foliage brighter in the Northeast United States than in Europe?
According to “Why Leaves Turn Color,” why is fall foliage brighter in the northeast United States than in Europe? Europe has too much air pollution. The United States has many varieties of maple trees, but Europe does not. The United States has cooler nights and drier, sunnier days in fall than Europe does.
Why might the author have chosen to organize forest fire in chronological order?
Why might the author have chosen to organize “Forest Fire” in chronological order? She wanted to create the same suspense for readers as she felt at the time. a forest fire looks, sounds, smells, and feels.
What is the connection between the forest fire and the mudslide in forest fire?
What is the connection between the forest fire and the mudslide in “Forest Fire”? The mudslide is due to rains and lack of trees to hold the wet earth on the mountain. Why might the author have chosen to organize “Forest Fire” in chronological order?
Which of the following is a good reason for a prescribed burn?
Which of the following is a good reason for a prescribed burn? Too much fuel is available and needs to be removed to prevent a larger fire.
What is the difference between preheating and pyrolysis?
What is the difference between preheating and pyrolysis? Preheating involves drying of the fuel, pyrolosis involves a chemical change in the fuel. Fuel is ignited, leading to flames and smoldering.
Were there wildfires before humans choose the best answer?
3) Were there wildfires before humans? (Choose the best answer.) A) Yes, but they were relatively very small because they had natural causes.
How does the presence of mountains increase wildfire incidence or intensity?
All of the above increase wildfire incidence or intensity: air dries as it descends down mountains, mountains circulate winds causing fires to move more quickly, fires moving upslope preheat materials ahead of fire making them easier to burn, and drier materials are found on slopes that face sunlight during the day.
Why doesn’t Dr Logan feel the bed bug feeding on him?
Terms in this set (36) Why doesn’t Dr. Logan feel the bed bug feeding on him? The bed bug injects an anesthetic as it feeds. The infectious agent is inactivated within the gut of the bed bug.
Why do we often get an itchy red bump after being bitten by a bed bug?
When bedbugs bite, they pierce your skin through a ‘beak’ and they excrete a tiny amount of anesthesia and inject an anti-coagulant to prevent your blood from clotting, so they can easily feed. Quite often it’s a person’s sensitivity to the anti-coagulant that determines the size of the bites and their itchiness.
Which of the following is thought to be most closely related to humans?
Humans, chimpanzees, gorillas, orangutans and their extinct ancestors form a family of organisms known as the Hominidae. Researchers generally agree that among the living animals in this group, humans are most closely related to chimpanzees, judging from comparisons of anatomy and genetics.
Which two main clades branch from the most recent common ancestor of the Eumetazoans?
In Figure 33.2, which two main clades branch from the most recent common ancestor of the eumetazoans? Thus the correct answer is [c], Cnidaria and Bilateria.
Do Ectoprocts lack distinct heads?
Ectoprocts lack a distinct head. Rotifers are smaller than many protists. Tapeworms lack a mouth and gastrovascular cavity. Rotifers are smaller than many protists.
How are specialized tissues important for animal function and complexity?
How are specialized tissues important for animal function and complexity? Specialized tissues allow more efficient functioning because differentiated tissue types can perform unique functions and work together in tandem to allow the animal to perform more functions.
Which of the following is a characteristic of cnidarians?
Cnidarians share several basic characteristics. All Cnidaria are aquatic, mostly marine, organisms. They all have tentacles with stinging cells called nematocysts that they use to capture food. Cnidarians only have two body layers, the ectoderm and endoderm, separated by a jelly-like layer called the mesoglea.
What are 3 characteristics of cnidarians?
Characteristics of Cnidaria:
- Radially Symmetrical.
- Body multicellular, few tissues, some organelles.
- Body contains an internal cavity and a mouth.
- Two different forms exist, medusa and polyp.
- Reproduction is asexual or sexual.
- Has a simple net like nervous system.
- Has a distinct larval stage which is planktonic.
What are five characteristics of cnidarians?
Terms in this set (5)
- 5 main features of cnidarians. soft bodied, carnivorus, with stinging tentacles, body symmetry, and specialized tissue.
- 3 groups of cnidarians. jellyfish, hydras (and relatives), and sea anemones and coral.
- statocyst.
- ocelli.
- human activities that hurt coral.
What is a Nematocyst?
Nematocyst, minute, elongated, or spherical capsule produced exclusively by members of the phylum Cnidaria (e.g., jellyfish, corals, sea anemones). Several such capsules occur on the body surface.
What triggers a Nematocyst to activate?
When a cnidocyte is triggered it fires a stinging cell called a nematocysts. When stimulated to discharge the permeability of the nematocyst changes and the internal osmotic pressure causes water to rush into the capsule. The cnidocyte is the trigger that releases the stinging cell, a nematocyst.
What is Nematocyst write its importance?
Nematocysts are organelles that have stinging cells. They are present in Cnidarians. Nematocyst paralyses the preys by injecting poison and helps Cnidarians to catch their prey.
What is a Nematocyst and what is it used for?
Nematocysts or cnidocysts represent the common feature of all cnidarians. They are large organelles produced from the Golgi apparatus as a secretory product within a specialized cell, the nematocyte or cnidocyte. Nematocysts are predominantly used for prey capture and defense, but also for locomotion.
What are the 4 functions of nematocysts?
The 25 or more known types of nematocysts can be divided into to four functional categories: those that pierce, ensnare, or adhere to prey, and those that adhere to the substrate. During development a collagenous cyst, which may contain toxins, forms; a hollow thread, which becomes coiled as it invaginates, develops.
How does the Nematocyst work?
A nematocyst is a specialized organelle found in all cnidarians. When it is triggered to discharge, the extremely high osmotic pressure within the nematocyst (140 atmospheres) causes water to rush into the capsule, increasing the hydrostatic pressure and expelling the thread with great force.
What is the difference between Cnidocyte and Nematocyst?
A cnidocyte is present on the skin of the creature (on the tentacles in the case of jellyfishes) whereas a nematocyst is present inside the cnidocyte. A cnidocyte is like an inverted cell whereas a nematocyst is a bag-like and globular structured subcell.
Why are Cnidaria important?
Cnidarians are very much important as predators in the open ocean. They help in the smooth functioning and working of the food chain and food web of the ocean ecosystem a lot. Cnidarians like the Coral reefs are considered to be one of the most diverse and valuable ecosystems on earth.
Where do hydras live naturally?
freshwater
Are Choanocytes significant to a fundamental?
Are choanocytes significant to a fundamental process for sponges? Choanocytes are fundamental to the nutrition of the sponge. Choanocytes keep water flowing through the spongocoel and obtain food, which is necessary for maintenance, growth, and reproduction. In some species, they also produce reproductive cells.
Are spicules significant to a fundamental process for sponges in what way?
In what way are spicules significant to a fundamental process for sponges? Spicules not only support cells of sponges, they also help larvae to stay buoyant while in the plankton or reach the bottom at settlement, enhance reproduction success, or catch prey.
Which special cells are used by Scyphozoans to feed?
Nearly all (about 99 percent) cnidarians are marine species. Cnidarians contain specialized cells known as cnidocytes (“stinging cells”), which contain organelles called nematocysts (stingers). These cells are present around the mouth and tentacles, serving to immobilize prey with toxins contained within the cells.
What are spicules?
1 : a slender pointed usually hard body especially : one of the minute calcareous or siliceous bodies that support the tissue of various invertebrates (such as sponges) 2 : a spikelike short-lived prominence appearing close to the chromosphere of the solar atmosphere.