The red tides in the ocean are primarily caused by the rapid multiplication of: MCQ with Answer and Explanation

Explanation:
Active transport uses energy (usually ATP) to pump molecules or ions across a membrane against their electrochemical gradient, e.g., Na⁺/K⁺ pump. Diffusion, osmosis, and facilitated diffusion are passive processes that move substances down their gradient without energy expenditure.

Explanation:
Panthera leo is the binomial name for the lion. Panthera tigris is the tiger, Felis catus is the domestic cat, and Canis lupus is the grey wolf. The genus Panthera includes roaring cats: lion, tiger, jaguar, and leopard. Binomial nomenclature uses a capitalized genus and lowercase species epithet, both italicized.

Explanation:
ADH (vasopressin), released from the posterior pituitary, increases water permeability of the collecting duct and distal tubule, promoting water reabsorption and producing concentrated urine. Its secretion is stimulated by increased plasma osmolarity or decreased blood volume. Aldosterone regulates sodium reabsorption. Parathyroid hormone and calcitonin regulate calcium.