Answer:
1 = A
2 = B
3 = B
Explanation:
1) Black holes occur when really big stars collapse on themselves. And, in order to get big, the star has to be an old one.
2) A black hole is something huge that swallows up everything, while a protostar is just the very beginning of a star.
3) Scientist can't truly know for sure, but they can infer about them due to the effects of the surrounding areas.
This is true , trees loose their leaves as a part of growth, also in seasons they loose leaves.
The answer is D. in animal cells, the cell membrane allows materials in and out of the cell, while the mitochondria uses nutrients to make energy (ATP) for the cell.
The biological factors other than lateral and ventromedial hypothalamus that influence hunger are; the blood sugar level-glucose, Hormones-Insulin must be present to extract glucose from blood and stimulates the storage of food, and set point. Additionally, we have environmental factors that influence hunger, these includes; taste, learned preferences, habits, stress and external food cues.
-<span>- </span><span>It is considered to </span>be<span> the link between the lobe-finned fishes and early ... Climate and</span>geography<span> ... </span>Sea<span> levels were high with </span>much<span> of western North </span>America<span> under water. ... By the mid-Devonian, the </span>fossil record<span> shows evidence that there ... Plants, which had begun colonizing the land</span>during<span> the Silurian ...</span>
