The photograph shows rockweed which feature allows rockweed to withstand the constant wave action of it environment a. tentacles b. bioluminescence c. photosynthetic leaves d. holdfasts

D. Holdfasts

“Seaweeds” comprise three distinct main phyla of algae: red, green, and brown. Rockweed is a brown alga, as its color shows. The typical dichotomous branching model recognizes it, as does its profuse germination in the upper and middle intertidal zones. Distichus points to the contrary rows of leaflike formations on each side of every branch. A prominent midrib runs underneath any section of the thallus, The holdfast is tiny, the stipe (“stem”) short.

Explanation:

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.