What was life like during the Paleozoic Era? By the end of the Paleozoic, cycads, glossopterids, primitive conifers, and ferns were spreading across the landscape. The Permian extinction, 244 million years ago, devastated the marine biota: tabulate and rugose corals, blastoid echinoderms, graptolites, and most crinoids died out, as did the last of the trilobites. […]
How can a student save water?
How can a student save water? How to save water at school Collect excess water and use it wisely. If not using the tap, turn it off. Report leaks. Use a container to wash your brushes. Use a refillable water bottle. Talk to others about water. Install aerators on taps. Install rainwater tanks. Do we […]
What are 3 characteristics of cyanobacteria?
What are 3 characteristics of cyanobacteria? Defining cyanobacteria characteristics are a tolerance of extreme conditions and an ability to exist without vitamins. They use phosphorus, iron and other micronutrients, and ammonia or nitrate as a nitrogen supply. Some types of cyanobacteria are filamentous and don’t need sunlight. What does cyanobacteria do to humans? Exposure can […]
Can be drawn into thin wires?
Can be drawn into thin wires? ductile: A material that can be drawn into wires. malleable: Means that the material can be hammered into very thin sheets without breaking. metal: An element that is a good conductor of heat and electricity. What are the two properties that make metals a good choice to use as […]
Is 99.4 a fever under the arm?
Is 99.4 a fever under the arm? It’s normal for your body temperature to fluctuate throughout the day. But in general, if you’re an adult and your temperature is above 100.4°F (38°C), you have a fever. What body temp is too low? Hypothermia is a medical emergency that occurs when your body loses heat faster […]
Why is cu2+ more common than Cu+?
Why is cu2+ more common than Cu+? Stability depends on the hydration energy (enthalpy) of the ions when they bond to the water molecules. The Cu2+ ion has a greater charge density than Cu+ ion and thus forms much stronger bonds releasing more energy. Is Copper 1 or 2 more common? Copper is the earth’s […]
What are 5 causes of biodiversity loss?
What are 5 causes of biodiversity loss? Five main threats to biodiversity are commonly recognized in the programmes of work of the Convention: invasive alien species, climate change, nutrient loading and pollution, habitat change, and overexploitation. What are the types and examples of biodiversity? Biodiversity includes three main types: diversity within species (genetic diversity), between […]
What are the mobile electrons of a pure metal called?
What are the mobile electrons of a pure metal called? The Metallic Bond The electrons in the outer energy levels of a metal are mobile and capable of drifting from one metal atom to another. What metal can withstand 6000 degrees? Tantalum carbide (TaC) and hafnium carbide (HfC) are refractory ceramics, meaning they are extraordinarily […]
How do you calculate the force to push an object?
Should carrots float or sink?
Should carrots float or sink? What’s happening in there? The carrot is more dense than fresh water so the carrot sinks in fresh water. When salt is dissolved in the water, the density of the water increases until the salt water becomes more dense than the carrot which makes the carrot float in the salt […]