Valerie hypothesizes that frogs lay more eggs in warm water than in cold water. When Valerie designs her experiment, what should be the only variable that changes?

A.

frog species

B.

time of year

C.

water temperature

D.

water flow rates

When considering a possible dating partner, the first attraction is:?

How are proteins and nucleic acids related? If one nucleotide were changed within the nucleic acid molecule, how could that affect the protein being produced?

Which hereditary rule explains why a self-fertilizing parent that is heterozygous for the A locus (Aa) can produce offspring that are AA or aa? A. principle of segregation B. principle of independent assortment C. dominance D. codominance

If our circulatory system carries white blood cells and circulates water in blood plasma, why do you think we need a lymphatic system?

What kind of body covering does a toad have?

Which structure of the trachea prevents it from collapsing inward and obstructing the air passageway?

What is a Divergent boundary and where is located?

A species displaying which of the survivorship curves is likely to produce the most offspring?

When comparing dogs to wolves, scientists found evidence that supports the idea they come from a common ancestor.

Riddle: I'm mostly made of water, but that's not all. I fill up the cell, from wall to wall.