The pH of the lake is a measure of the hydrogen ions present in the water. Select three which contribute to the pH of the lake due to their influences on carbon dioxide levels.

Explain why ecosystem diversity results in species diversity in a healthy biosphere

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.

The pressurized plants and fungi mentioned in the video have some surprising similarities. what differences would you expect them to have?