The correct answer is 1. A) cell membrane and 2. C) rough endoplasmic reticiculum.
Explanation:
The outer covering of any cell is called cell membrane. Cell membrane is the outermost layer of the cell that enclose all cell organelle and cytoplasm. It is made of lipid bilayer.
The organelle with a texture like a sand paper is the rough endoplasmic reticulum. Rough endoplasmic reticulum is present in eukaryotic cells. Its major role is to generate proteins.
Thus, the correct answer is 1. A) cell membrane and 2. C) rough endoplasmic reticiculum.
The definition of a biological species is that they will only breed with members of their own species. If the two populations of chimps will no longer interbreed, then they are considered separate species = speciation.
Almost 20 years later, the number of zebra mussels has declined overall. And parts of the ecosystem, such as the number of zooplankton, native mussels, and clams, have started to increase.