Infection, which are antigens that harm your body.
Answer: It is True species richness grows twoards the poles
Answer:
DNA means deoxyribonucleic acid he is the small part of cell
Insects, and some other invertebrates, exchange oxygen and carbon dioxide between their tissues and the air by a system of air-filled tubes called tracheae. Tracheae open to the outside through small holes called spiracles.
