About 225 million years ago, North America and South American were part of one huge landmass, Pangaea.

Which is considered the first stage of the cell cycle?

Put the following events in the correct sequence of activation for the somatic motor neuron pathway: Correct! An action potential is propagated down the lower motor neuron. Correct! Calcium levels increase in the cytoplasm of the muscle cell.

The cell body; responsible for nutrients

Which best describes carbon dioxide's path out of the body?

Explain why every cell must contain the same dna

Air pollution is caused by A. natural events and human activities. B. human activities but not natural events. C. heavy rainfall. D. the sun.

Which of the following can increase the growth of algae when it enters streams? A) insecticide B) herbicide C) carbon dioxide D) oil

Which are the best examples of types of molecules used for energy storage by organisms? Choose all answers that are correct. A. lipids B. proteins C. nucleic acids D. carbohydrates

Tell me five different invasive species

How much energy is produced by each type of macromolecule