What are the advantages of large organisms being multicellular?

The following image is of a diatom. it lives in water and gets food from photosynthesis. it is encased in a hard shell made of something similar to glass or sand . a diatom is a(n) because it has a) multi-celled organism; specialized parts. b) vertebrate; a skeleton. c) insect; an exoskeleton. d) single-called organism; only one cell.

Study this image which statement best describes the rock shown check all that apply

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )