How many essential amino acids are there 22?

Match the following. 1. protons no charge 2. neutrons positive charge 3. electrons negative charge

Which is NOT a characteristic of life? adaptation breathing homeostasis reproduction

What does the octet rule state that explains why atoms bond? An atom bonds to have eight valence electrons to become stable. An atom bonds to lose eight valence electrons to become stable.

A newborn infant at springfield hospital has only a single 23rd chromosome. based on this, this infant is best described as

How does your body know when to breathe?

Exotic pets, such as lizards and tarantulas, have increased in popularity. These animals are caught in the wild and sold as pets. What are two possible effects this action can have on biodiversity?

How do ice ages affect the surface of the Earth?

Which of earth s spheres includes mammals, fishes, and birds? hydrosphere biosphere atmosphere geosphere?

How fast does the human heart beat when under stress?

a. a small structure within a cell. b. a structure composed of several tissue types. c. the basic structural unit of all living organisms. d. a group of organs with a common set of functions. e. a group of cells with similar structure and function.