Which of the following is NOT studied by demographers?

a. Growth rate c. Geographic distribution

b. Age structure d. None of the above

Which of the following cells would not have a well-defined nucleus but would have a thick cell wall and ribosomes?

What would happen if the keystone species of hummingbirds were taken out of there ecosystem?

Are bacteria classified by size?

Levels of Biology: A student is investigating the types of insects found in a section of Fairmount park. He marks off a 10 m x 10 m section of land near the river. He then collects as many different species of insects that he can find.

In a human somatic cell (normal body cell that is in g2, what would be true about chromosome number and structure?

Which statement best describes the relationship between activation energy and rate of reaction? O Increasing the activation energy can increase the rate of a reaction. O Reducing the activation energy can increase the rate of a reaction.

Definition: this is a haploid cell with half the reproductive information from the parent.

Does a cell use energy when molecules diffuse in or out of the cell? Why?

Below is a list of possible challenges. Check all errors that you mentioned in your answer. Traits other than beak type might affect natural selection. It could take many generations to observe adaptions to a population.

A farmer dug a well but did not find any water Which reasons most likely explain why the farmer did not find water? Check all that apply.