The movement of earth's tectonic plates is related to a. cycles of sunspots. b. movements of materials in the mantle. c. phases of the earth's moon. d. seasonal changes in weather systems.

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

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.

Por qué crees que los huevos con cáscara se llaman amnióticos?