The leaves of plants have layers that perform different functions. The layer contains chlorophyll which carries out most of the photosynthesis in the leaf.

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.

What is an endocrine function? (apex) a.esophageal glands release mucus into the esophagus b.salivary glands release saliva into mouth c.swear glands release sweat to the skin d.the pineal gland releases melatonin into the bloodstream

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?