sweat glands are widely distributed across the body surface, glands are located wherever hair follicles exist, and sweat glands are found only in a few areas.

Explanation:

Merocrine: merocrine sweat glands are widely distributed across the body surface,

Sebaceous glands are located where hair follicles have existed,

apocrine sweat glands are found only in a few areas like axilla. Apocrine -are restricted to specific areas like the axilla, nipple of the breast, pubic region and around the anus area etc.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

a. the production of carbon dioxide through the process of photosynthesis