About how many years ago was the earth created

In 2006, scientists discovered fossilized skeletons of an animal with several interesting features. Fossil evidence indicated that the animal not only had scales, fins, and gills, but also had lungs, a full set of ribs, and limb bones arranged to

Which cell type can specialize into any other type of cell in the body?

Which degree of tilt produced light similar to what North America experiences in summer? Explain your answer.

6. Why do we need to breathe all day and all night?

Why do fluids leave the capillaries at the arterial end?

Which type of air mass is likely to bring warm, dry air? A. continental polar B. maritime polar C. continental tropical D. maritime tropical

There is a population of bear that has declined. New neighborhoods are being build, as such the bear no longer have a place to live. WHich type of limiting factor is this situation?

Characterizing Streams and Rivers Quick Which statements accurately describe slow-flowing areas of streams and rivers? Check all that apply. Slow-flowing areas usually contain a lot of oxygen. Slow-flowing areas usually have warm water.

Birds are called glorified reptiles. why?

The combustion of glucose ultimately involves the transfer of electrons to oxygen (O2). In biological systems, this takes place without a large increase in temperature.