Why are biologists and ecologists interested in determining the sizes of populations of organisms ms other than humans

What’s this animal (picture is tagged) and where is it most likely to live, rainforest or desert?

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

The combining form leuk/o means red true or false