Why is it necessary for animals to have a circulatory system?

O to move blood

O to breathe

O to maintain homeostasis

O to exchange materials with its environment

The force of muscle contraction is controlled by multiple motor unit summation or recruitment. True or False

Biosynthesis of many molecules in cells, and many modifications of macromolecules like proteins, RNA, and DNA require addition of single carbons.

A girl found the skull of an animal. She didn't know what the animal was, but she was sure it preyed on other animals for its food. What could have led her to this conclusion?

What types of carbohydrates can yeast use as a food source?

Which of the following statements about the brain development is TRUE? A. brain areas liked to thinking, memory, and language develop late in childhood B. at birth, we have the largest quantity of brain cells we will ever have C.

What would be the consequence of of absence of tRNA in the cytoplasm?

Water which is returned to the environment after secondary treatment is known as:

Which tool is best used to predict the outcome of various genetic combinations?

What part of the brain consists of two large hemispheres?

How many Calories are in 1 serving cup skin milk? n