The correct answer is:
d. none of the above
Explanation:
Energy is transferred between organisms in food webs from producers to consumers. The energy is used by organisms to carry out complex tasks. ... At each stage of a food chain, most of the chemical energy is converted to other forms such as heat, and does not remain within the ecosystem.
Advantage - having natural automatic antibodies and defences to defend the body from any unknown organisms invading or intruding.
disadvantage -<span>The bodies of mammals are always maintaining the temperature through processes which is why constant food consumption is necessary.</span>
It is called Maturation, Development, and Growth
B is the correct answer Crossing over does not occur between genes