skin
conjunctiva
oral cavity
teeth
mucous membrane
upper respiratory tract
nasal membranes
pharynx (throat)
lower respiratory tract
gastrointestinal tract
stomach
small intestine
colon
urogenital tract
anterior urethra
vagina
Answer:
C
Explanation:
To support abiotic and biotic life forms.
Photosynthesis. These are the reactants for photosynthesis and the products of cellular respiration.