Why are protozoa significant? select all that apply.
protozoa contaminate the water supply.
protozoa do not contribute to a food chain.
some protozoa clean polluted water.
some protozoa are parasitic and cause diseases like malaria.
protozoa have an important role in the food chain.

Which of the following are causes of coastal erosion? check all that apply. beach grasses and other plants trap windblown sand. wave action carves away the coastline. groundwater under pressure is forced to earth’s surface. artificial structures stop the natural flow of sand along the coast. underground caves collapse as bedrock is dissolved.

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

What is the approximate time of death of the body temperature is 29.4 degrees celsius