A biology student wants to conduct a study of how the amount of food affects weight gain for mice. He sets up four cages with a mouse in each cage. What are the independent variable, dependent variable, and constants? For the independent variable, what would you put in the box below for each mouse?

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

Indicate whether the following statements about the biases in the fossil record are true or false. a) inland species are more likely to be preserved than marine species b) organisms with hard body parts are more likely to be preserved than are those composed soft tissues. c) species that existed over a larger area are more likely to be preserved than species existing over a smaller area. d) organisms that lived very long ago are more likely to be found as fossils than organisms that lived relatively recently e) the fossils of larger organisms are more likely to be found than the fossils of smaller organisms

Which sequence correctly shows the path of carbon dioxide during repiration?