Which of the following events would most unpredictably affect an ecosystem?

A. the removal of one old tree

B. a mutation in a native bacteria

C. the annual birth of a new generation of deer

D. a rainstorm that causes minor flooding.

Which of the following statements about water correctly explains why most of Earth's surface is covered by oceans? Water remains liquid at most temperatures on Earth. Liquid water takes the shape of its container.

Plants have a more complex level of cell organization than any other kingdom. a. True b. False

You have arrived on the scene of an incident involving an explosion. People in the immediate vicinity are all experiencing runny noses and difficulty breathing. Some are having convulsions. You suspect a terrorist incident involving a: A.

The physical location of a gene within the genome is called

What era did the mammoth appear

Which of the following steps is an important part of the process by which ecology guides human to a sustainable future?

Estuaries are very productive ecosystems because they receive nutrients from rivers and oceans. a. True b. False

What is found about 10 km above earths surface

There is no fusion of gametes in this type of reproduction

This is any substance used in treating or alleviating the symptoms of a disease or injury.