The first step a biologist takes when deciding how to study like is to

Tasha has just given birth to healthy twins. one of the twins has an x and y chromosome, while the other has two x chromosomes. these twins are

What happened if a hypothesis is wrong

Which of the following adaptions made it possible for plants to surive on land?

The increase of carbon dioxide in the atmosphere has had which effect on the earths climate? A) average rainfall has decreased. B) extreme weather has become less common C) the earth's temperatures are rising. D) the earths temperatures are falling

Which of the following is not considered a pathogenic organism? a. bacteria b. virus c. chemicals d. parasites

How would the ecosystem be affected if your top predators were hunted to extinction

3 ways that living creatures use lipids

Absolute dating can be determined by which of the following. Select all that apply. A. tree-ring patterns B. Earth's magnetic field C. a historian's journal D. coral growth cycle E. radioactivity F. photo comparison

What conditions cause the contractile vacuole to fill with water?

Which of the following is most likely responsible for the fact that organic molecules no longer formed spontaneously on Earth? A. The amount of UV radiation increased B. The amount of oxygen in the atmosphere increased C.