Which of the following best describes the matter present in an ecosystem? A.
New matter is continuously generated by an ecosystem in a process known as photosynthesis.
B.
The waste materials generated by one organism are often reused by other organisms.
C.
The total amount of matter in an ecosystem is constantly decreasing due to the process of decomposition.
D.
When an organism reproduces, new matter is added to its ecosystem.

D

Explanation:

When an organism reproduces, new matter is added to its ecosystem, is the correct answer.

It's is the second one. The waste materials generated by one organism are often reused by other organisms.

Explanation: Mass, or matter, is conserved in all physical and chemical changes. Matter is not created or destroyed within ecosystems, it only undergoes physical or chemical changes. One example of this process is that the waste materials generated by one organism are often reused by other organisms as food or nutrients.

the answer is c. it will give up it's valence electron to the other atom.