What are the loosely packed photosynthetic cells in the leaf called? a. epidermis b. guard cells c. spongy mesophyll d. palisade mesophyll

Option C

Explanation:

These cells are soft because of its function. Gaseous exchange takes place by the help of these cells. Spongy mesophyll cells are covered by thin layer of water and are loosely packed.

This is because, during the day time when the plant is performing photosynthesis these cells allows the carbon dioxide into the mesophyll cells and the oxygen out of the plant body.

The correct answer is D. Skeletal system.

Explanation

The parathyroid glands are glands of the human endocrine system that are located behind the thyroid glands in the neck. The main function of the parathyroid glands is to control the amount of calcium in the body (mainly bones and blood). According to the above, the parathyroid glands produce essential hormones for the proper function of the bone system because it controls the calcium that is used to strengthen the bones. These at the same time serve as the storage system to ensure that the body always has a vast source of calcium. So the correct answer is the D. Skeletal system.