If natural selection operates to select for a specific trait, which statement must be true about that trait for evolution to occur?

Energy in higher trophic levels is greater than energy at lower trophic levels.

Why is it important that scientists to state a conclusion

When two experiments are identical except for one variable, the experiment is called a (n) ?

A food chain is a circle. The transfer of energy moves from plant to animals to decomposer and back to plant. What supplies the energy the plants need? A. animals B. sun C. water D. wind

Initiating an action potential works best at short distances. (a) True (b) False

Suppose a large number of dead fish are found floating in a lake. how would you determine whether they died from cultural eutrophication or from exposure to toxic chemicals?

Which best explains how gravity contributes to the formation of layers in protoplanets? Gravity attracts materials and causes compaction, which produces heat and leads to the melting, sinking, and rising of materials.

1. As an object moves towards another object the sound waves bunch up. True Or False 2. As an object moves toward another object the sound waves have lower frequency. True or False. 3.

Do we classify viruses as living

What caused the evolution of antibiotic-resistant bacteria?