I am not sure but here is a link to help you :)
https://www.ncbi.nlm.nih.gov/pubmed/22322095
It is useful for an ecologist to identify the keystone species in an ecosystem because the keystone species is important to maintaining the stability of an ecosystem, and any changes in the keystone species population shows that there is changes in ecosystem health.
Answer:
Humus
Explanation:
Also known as the uppermost layer of soil, that's for making soil more fertile due to its organic content.
<span>On the left, they drain into the renal vein
which in turn drains into the inferior vena cava. By contrast, all the
lumbar veins and hepatic veins usually drain directly into the inferior vena cava.</span>
Answer:
Emy if you are new here let me tell you u can't a descriptive questionnn for 10 points u need to shoot it to 100
