What data support the hypothesis that the origin of bilaterians, the deuterostome–protostome split, and the lophotrochozoan–ecdysozoan split all occurred long before the Cambrian explosion?

In the diagram below, the northern hemisphere would be in what season at position a a. fall b. winter c. summer d. spring

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.

Choose the correct words to complete the sentences related to genetic screening. is a procedure that is used during pregnancy to detect genetic defects. is extracted from the uterus and used to identify genetic disorders?