Answer: Option B
Explanation: The thin layer that forms the outer covering of the cell is known as the cell membrane. It is composed of the lipid bilayer which as embedded proteins.
This membrane is selectively permeable which means it allows only specific molecules to pass through them.
The main function of cell membrane is to protect the cell from the outer environment and by the invasion of harmful bacteria and viruses.
D. The heat is there via convection from the sun
The answer is D has mitochondria and chloroplasts. In the leaf, so must have chloroplast, most eukaryotic cells have mitochondria (powerhouse of the cell)
Tendons :may also attach muscles to structures such as the eyeball. A tendon serves to move the bone or structure. A ligament: is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.
