Is the celestial sphere accurate?

Is the celestial sphere accurate? This Earth-centred Universe is, of course, not an accurate model of the real Universe, but it turns out to be an extremely useful tool for understanding the relative positions of celestial objects, and their apparent motions through the sky. What is a zenith and nadir? Nadir, a term used in […]

What are two major differences between prokaryotic bacterial and eukaryotic protist cells?

What are two major differences between prokaryotic bacterial and eukaryotic protist cells? Comparing prokaryotes and eukaryotes The primary distinction between these two types of organisms is that eukaryotic cells have a membrane-bound nucleus and prokaryotic cells do not. The nucleus is where eukaryotes store their genetic information. What are the three most common types of […]

How do plants lift water?

How do plants lift water? Hydraulic lift is the passive movement of water from roots into soil layers with lower water potential, while other parts of the root system in moister soil layers, usually at depth, are absorbing water. What is hydraulic conductivity used for? Hydraulic conductivity is a physical property which measures the ability […]

What happens if I get pregnant on birth control?

What happens if I get pregnant on birth control? Becoming pregnant while on birth control does increase your risk of ectopic pregnancy. An ectopic pregnancy occurs when a fertilized embryo attaches outside the uterus, often in the fallopian tube. This is a very serious, life-threatening problem and should be cared for immediately. Where do your […]

What happens when stomata are open?

What happens when stomata are open? When stomata are open, water vapor and other gases, such as oxygen, are released into the atmosphere through them. A number of factors can affect the exchange of gases between a leaf and the atmosphere. What allows stomata to open and close? Specialized cells known as guard cells surround […]

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