Just answer if you know the correct answer. Explain how some organisms use it directly and how some use it indirectly .
is about Cell Processes: Energy

the organisms which use energy directly are plants and the organisms which use energy indirectly are animals. As plants prepare there own food and get energy directly from it. And animals are dependent on plants so they get there food indirectly by plants and other animals.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

age range would be the answer