According to the endosymbiotic theory, which organelles were believed to be once simple prokaryotic cells? A. Mitochondria and Endoplasmic Reticulum
B. Endoplasmic Reticulum and Chloroplast
C. Endoplasmic Reticulum and Ribosomes
D. Mitochondria and Chloroplast

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.

2polnis which of the following is an advantage of an in vitro experiment?me

Agene editing technology called crispr-cas9 uses cellular machinery to change the cell's genetic material. how might this technology be useful in treating diseases like cancer?