D. egg cell and sperm
basically gametes make babies and those are the two things you need to create one.
Cells are the basic building blocks of life, which can join together to form tissues, while different groups of tissues join together to form organs. These organs are then connected together to form organ systems , such as the digestive system , which includes the stomach , esophagus , intestines and other organs .
Answer:
Animal Waste and Fertilizers
Explanation:
Animals, like humans, obtain nitrogen from consuming foods. The foods that the animals consume get digested and with time, the animals release the extra undigested foods and nutrients in forms of urine and feces. Like wise, fertilizers are typically made with animal waste.
I think it ( A ) if worngb sorry
The answer is greenhouse gases
