What was the source of the water that gave rise to the oceans?
What will be an ideal response?
Water was locked up in the Earth in chemical associations with the minerals of the planet. With gradual heating and cooling, the water vapor escaped, forming clouds, which eventually gave rise to condensation and rain that accumulated in the ocean's basins.
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Plant tissue noted for storage, secretion, and
regeneration is
a. vascular cambium. b. parenchyma. c. collenchyma. d. sclerenchyma. e. none of these
Peripheral vasodilation is a response to
a. heat. b. hunger. c. cold. d. exercise. e. thirst.
Name the immune cell that interacts with and kills an infected "self" cell.
A. macrophage B. cytotoxic T cell C. B cell D. helper T cell
What is the name of the enzyme that forms nitric oxide?
a) nitrous oxide hydrolase b) nitric oxide dismutase c) nitric oxide synthase d) nitric oxide oxidase