Answer:
In science, a variable is any item, factor, or condition that can be controlled or changed
Answer:
C) It involves interactions between biotic and
abiotic factors.
Explanation:
Ecosystems need energy imput, need both consumers and producers, and can exist on land, lakes, rivers and oceans.
Oswald Avery in 1944 discoveries DNA was responsible for storing and passing information throughout generations
The animal it gave birth to
