Which of these changes to Earth's surface is caused by constructive forces? 0
A. a waterfall carving a canyon into rock
a
B. soil made from broken-down bedrock
C. sand made from tiny pieces of seashells
D.
a sandbar built up by sand from the shoreline

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Hector is back from his morning run and is feeling light-headed because his energy is depleted which food item will provide him with a quick source of carbohydrates

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.