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.
Answer:
Plant cells contain chloroplasts since they need to perform photosynthesis, but animal cells do not.
Explanation:
animal cells do not have a cell wall or chloroplasts but plant cells do. Animal cells are mostly round and irregular in shape while plant cells have fixed, rectangular shapes.
Answer:
Scientific method......I think
9. answer: enzymes are made of the macro molecule PROTEIN
The most probably cause would be dehydration because headaches and drowsiness are symptoms of it.
