Ray is studying the Texas prairie ecosystem and is starting off by identifying all the abiotic and biotic factors in that ecosystem. Which of the following lists contains only biotic factors? A water, temperature, amount of daylight, soil
B grasses, bacteria, flowers, insects, birds
C deciduous trees, woody plants, water
D bacteria, protists, fire, plants, animals

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. reactivate d) a dog is getting hot in the sunlight, so he moves to a shaded area.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.