__is an element found in all organic molecules during respiration, animals excrete it as a gas known as

1.carbon

2.carbon dioxide

Explanation:All animals exhale out carbon dioxide during respiration. Carbon dioxide is a byproduct of respiration, it Is harmful If it stays in the body for long and needs to be excreted out from the body

Plants instead of excreting out carbon dioxide use it produce glucose and oxygen, that is later on used by the animals themselves

they have sperm in my gf's mouth

explanation:

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