Answer:
Chemical energy eventually leaves an ecosystem, when the top predator eventually dies. Other plants and animals will use this energy because when the dead body decays, the plants will take some of it through the soil, and put back into the cycle.
Explanation:
Answer:
Coal
Explanation:
Helped work become faster.
Answer:
There would be no life (except for viruses [if they are considered to be alive]).
Explanation:
These cells are the "building blocks" of life, and all have RNA or DNA in them and a membrane around the outside. The only example of something "alive" without cells might be viruses (like what causes chickenpox or the flu) which are just packets of protein and DNA.
Answer:
The answer is C, Between 40 and 60 mg/kg
Explanation:
I just took the test and it was right :)