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.
Common types of symbiosis are categorized by the degree to which each species benefits from the interaction: Mutualism: In mutualistic interactions, both species benefit from the interaction. ... Commensalism: In commensalism, one organism benefits while the other organism neither benefits nor suffers from the interaction.
The answer is true that humus in soil comes from eroded rocks
Answer:
The correct option is C. Different types of cells within an organism serve different functions.
Explanation:
All kinds of cells found in the body emerge from the stem cells. The stem cells divide by a process of cell differentiation and make specialized cells. Each cell is specialized to perform its own functions. For example, nerve cells in the body transmit signals in the body whereas white blood cells of the body are involved in providing immunity to the body. The specialized cells work together and make specialized tissues.