As water molecules move through the hydrological cycle, water both gains and loses energy. What is the main source of energy that drives the hydrological cycle?

1. The sun

2. Tides

3. Evaporation

4. Wind

True of false? Snakes have slimy skin.

What does the DNA serve as?

When do humans switch from aerobic respiration to anaerobic respiration?

What is a scientist called who observes animals in order to explain their behavior? ecologist ethologist environmentalist psychologist

Amoebas prey upon algae in aquatic environments.

Polymers are made of individual subunit called

What are the exergonic reactions that provide living systems with energy (give two examples) ?

The roots of a plant are usually located underground and composed of which of the following tissue systems?

You are excavating a Native American human burial site which contains both males and females. After obtaining permission from current Native American tribes believed to have descended from these people, you analyze the bones.

Cells that engulf and destroy bacteria