What is nessecary for a convection cell to be set up in a fluid? 1.) thermal gradient and changes in density. 2.) changes in density 3.) thermal gradient

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.) chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

Eutrophication caused by human nutrient pollution.