How do populations, and communities respond to external factors such as pollution?

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.