Which of the following best describes the function of the cell membrane? A. The cell membrane provides rigid support to plant cells.
O B. The cell membrane forms the boundary of a cell and is the site of
cell-to-cell communication,
C. The cell membrane combines amino acids into long chains to
make proteins
D. The cell membrane surrounds and supports organelles in
eukaryotic cells

i think it's D

Explanation:

The plasma membrane, or the cell membrane, provides protection for a cell. It also provides a fixed environment inside the cell, and that membrane has several different functions. One is to transport nutrients into the cell and also to transport toxic substances out of the cell.

cooling as the lava runs down the mountain

melting of rocks to form magma underground

Explanation:

Which processes contribute to the formation of rock at point R? Check all that apply.

cooling as the lava runs down the mountain

melting of rocks to form magma underground