The following are the four main gorups
1-Protozoans with Pseudopods
2-Ciliates
3-Flagellates
4-<span>Parasitic Protozoans</span>
Answer: burning of Fossil fuels can disrupt the carbon cycle as it produces CO2 ,which causes environmental problems such as acid rain ,global warming , greenhouse effect etc.
Explanation:
<span>A) Kelp is the keystone species because their survival is key to the survival of the entire ecosystem. </span>