What is the "fluid-filled sac" that cushions the embryo?

A) Amnion B) umbilical C) uterine cavity

What is internal and external stimulus? what is an example of each?

An object is dropped on Earth from a height of 15 m. How long did it take for the object to reach the ground?

Which term applies to the biological aspect of a woodchuck living in underground burrows, eating plant food, and feeding often in open areas? A. productivity B. niche C. ecosystem D. energy flow

Why is it necessary to have interneurons? A To send messages to the body. B To send messages to the central nervous system. C To assist afferent and efferent neurons in their jobs to send messages. D To move our muscles.

What part of the cell contains hereditary information? What's the difference between an animal's cell and a plant's cell?

The study of the eating habits of grizzly bears is in which field of biology

What functional groups define the two different ends of a dna strand?

True or false: animals contribute most of the organic remains that form humus

What would cause a person to have headaches from the sun only when not wearing a hat?

When in the cell cycle would you find sister chromatids?