How much of the worlds water is saltwater? A. 97.5%. b. 50% C. 25% D. 2.5%

Pollution stays in the area where it is produced. a. True b. False

In a population, the changes in allelic frequencies of a gene that are due to chance.

What would happen to the size of the carnivore population if the herbivore population increased? decrease increase die off stay the same

Materials are returned to the blood from the filtrate by which processes?

Which part of the eukaryotic cell contains information throughout the cells functions

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?