What is one event that marks the end of the Mesozoic era?

A. origin of birds

B. origin of mammals

C. extinction of dinosaurs

D. extinction of angiosperms

Consider the cladogram representing most of the major categories of animals. what physical characteristic is used to divide the animals into the two main clades?

At the complete end of cellular respiration, how many molecules of ATP are produced? ces RAMS A. 38 B. 26 C. 15 D. 34

A group of field biologists goes out to mark beetles living in an area around a local pond in order to estimate population size. They capture 500 beetles on the first day.

How does differentiation lead to tissues in the developing organism

Answer Choices: A. An acidic solution B. a basic solution C. a neutral solution D. there is no way to tell whether it is An acid or a base.

Why is dark matter difficult to measure? A) Because it does not exist in our galaxy. B) Because it disappears when it encounters ordinary matter. C) Because it creates so much heat it melts any instruments invented so far.

How is energy transferred from one organism to another

Explain why you need to get a flu shot every year.

Which of the following is a social consequence of global fuel dependence? a. rising costs of oil b. increase in atmospheric pollution levels c. poverty causing lack of access to fossil fuel resources d. an increase in the production of fossil fuels

The following flow of energy takes place in one ecosystem: alga → insect → larva flatworm → fish. Which trophic level has the most energy to pass on to the next? flatworm alga fish insect larva