Fish organ systems include a. a centralized nervous system with a brain. b. an incomplete digestive system with just one opening. c. a circulatory system with a four-chambered heart. d. all of the above.

For an Aa mother, what fraction of her eggs have an a allele?

Pitch is only taken into consideration when a sound is extremely low. True or False?

when matter i'm plants and animals decay, microorganisms responsible for the decomposition process are doing cellular respiration

What two impacts do fossil fuels have on the environment?

About two thirds of the world’s human population survive primarily by eating one or more of three grain crops. what are these three grains?

Which of the following aren't eukaryotes? plants bacteria animals fungi

In pea plants, smooth pea shape is dominant to wrinkled pea shape. If a pea plant that is true-breeding for smooth pea shape is crossed with a pea plant that is true-breeding for wrinkled pea shape, what will be true of the offspring?

Are atoms completely lost or gain in a chemical re

Epinephrine and norepinephrine that are released from the adrenal glands affect target tissue for a longer period of time than the same substances released from neurons at their peripheral receptors. why?

Interpret this phrase: "we respire because our cells respire"