Which ocean ecosystem has low productivity due to low light penetration

Mention true or false : a) cholera is marked by acute diarrhea and no urination. b)mosquitoes are the source of dysentery germs.

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?