Explain why multicellularity of an organism requires cell-to-cell communication.

You are part of which sphere of Earth? A) hydrosphere B) atmosphere C) lithosphere D) biosphere

How does the brain generate consciousness?

Which of the following can cause an increase in density that result in a deep ocean current? The sun heats the water's surface. Warm water loses energy to its surroundings and cools. A warm wind blows across cold water.

When the Grand Canyon formed, many small mammal population were divided. Some members of the population were on one side and others are on the other, therefore, they were not able to mate with one another.

Variation exists among individuals in a species

Dna strands serve as which of the following during dna synthesis

Use the information from part c to determine how the operon is regulated for this genotype (i - p + o + z + y-).

A mutation occurs in the sex cells of a full-grown zebra. The mutation affects the genes responsible for producing blood proteins. What will most likely happen to the zebra?

Malignant tumors are classified according to A. how quickly they divide. B. how quickly they spread. C. the type of cells that give rise to them. D. the type of cells they are most likely to spread to.

Which of the following statements is TRUE about vitamin and minerals? a. Vitamin D is a water-soluble vitamin that is stored as hydroxycholecalciferol and released so that bones and teeth form normally. b.