What substance is united or combined between the sperm and the ovum in order for
fertilization to occur?
O calcium
O deoxyribonucleic acid
O estrogen
O progesterone

Johannesburg kepler, an apprentice of brahe, believed in the heliocentric universe but rejected past astronomers belief in

Which statement describes an endocrine function rather than an exocrine function? a. salivary glands release saliva into the mouth. b. sweat glands release sweat onto the skin c. the pineal gland releases melatonin into the blood. d. esophageal glands release mucus into the esophagus.

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes