Which is the definition of an embryo?
a. prenatal stage of a human up to 8 weeks of development after fertilization.
b. prenatal stage of a human beyond 8 weeks of development after fertilization.
c. prenatal stage of a human up to 9 months of development after fertilization.

Which of the following does not describe a physical property of iron? a iron is silvery-white or gray in color. b iron has a boiling point of about 3,000°c. c iron is a magnetic element . d iron and sulfur react to form iron sulfide.

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.

What characteristic make legumes a good food source for food insecure populations