Answer:
C- a duck catching and eating a snail
Explanation:
Biotic factors involve living things. The only choice with two living beings interacts would be C.
3. water carbon dioxcide and oxygen
only those 3 things are found in nature
I looked it up and it was “c. Silicon “
Macrophages
Using the receptors on their surface and through the facilitation by immunoglobulins that attach to the foreign matter, macrophages 'hold' the foreign bodies in the body and 'ingest' them through phagocytosis. Lysozymes in the cells then in 'digest' the foreign matter.