Carefully analyze the diagram below. It shows the relative number of species in four groups of vertebrates over time. The thickness of each band shows the relative number of species in that group.

1.) Which of the groups shown has the greatest number of species today?

2.) which group experienced a significant decline in biodiversity at the end of the Mesozoic Era? *

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.