17- the germ theory im not sure a6out this one
18- increased soil erosion
19. Bubonic Plague
20. Regenerate
21. Type of wheat
Progressive age-changes in metabolism and physicochemical properties of cells, leading to impaired self-regulation, regeneration, and to structural changes and functional tissues and organs.
Conifers.
Or gymnosperms, depending on what "this plant" is.
Answer:
Membrane receptor proteins
Transport proteins
Membrane enzymes
Explanation:
hope that helps
Answer:C performing a courtship dance
Explanation: