Which sentence best represents the process through evolution occurs? a) organisms always exhibit dominant genes. b) mutations lead to disease. c) organisms that are fit, survive and reproduce. d) allele frequencies do not change.

Which of these parts of the membrane large moecules pass through it ?

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above