During which period did the first fish evolve?

Cambrian

Ordovician

Devonian

none of the above

Explain in complete sentences why lettuce or spinach in water becomes firm and crisp by cell membranes?

Systolic blood pressure is the amount of pressure that blood exerts

How can plastics in the ocean impact human health? Plastics in the ocean have no impact on human health, as the plastics only impact ocean organisms. Plastics in the ocean are harmful to ocean organisms but are generally not harmful to human health.

Sublimation is the opposite of deposition just as evaporation is the opposite of? A. Fusion B. Transpiration C. Freezing D. Condensation

Which part of the ayom cannot have its location accurately determined and is modeled by a cloud around the center of the atom

The main prey for the frogs in a certain pond are dragonflies. If the number of dragonflies is greatly reduced because of pesticide usage, how could the frogs adapt in order to survive?

When a male donkey is bred with a female horse, the offspring produced is a mule, which is healthy but sterile. Karyotyping experiments have revealed that horses and donkeys have different numbers of chromosomes, 64 for horses and 62 for donkeys.

If the genotype of both parents was Aa, what would be expected of the genotypes among their possible offspring?

Which of the following best identifies a physical digestive process? enzyme action heat formation peristalsis acid secretion

During the cell cycle, specifically g1 interphase, a cell must reach a sufficient size and produce enough atp in order to a. undergo mitosis. b. undergo cytokinesis. c. produce 2 daughter cells. d. replicate its chromosomes.