The first line of defense involves which structure? a. Tcell, b. skin, c. blood, d. b cell

Explain how DNA is vital to understanding evolution.

Which of the following best describes anabolic reactions? Reactions which break down complex molecules into simpler ones and release energy Reactions which involve a transfer of electrons between two species Energy-storing reactions which link

Cnidarians and ctenophores are similar in that they both have

C) How will the allele frequency change in the rat population?

Trees convert light energy to chemical energy. When wood is burned, chemical energy becomes thermal energy. This heat can be used to run turbines (mechanical energy) that eventually create electrical energy.

Suppose you use a microscope to look at a cell from the leaf of a tree. What structure will you see that would not be found in a cell from your fingernail? A. mitochondria B. cilia C. cell wall D. ribosomes

Name the three energy roles that organisms fill in an ecosystem.

Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. Adrenergic postganglionic neurons release the hormones norepinephrine and epinephrine. True False

Which of the following are examples of the first specialized tissues?

Which structure of the trachea prevents it from collapsing inward and obstructing the air passageway?