Answer:
C
Explanation:
Keystone species is the sea otter. Sea otters, playing a critical role in containing the urchin populations, prey on urchins and thus control the numbers of kelp grazers to maintain the forest.
Remember, keystone species is most often a top level predator in an ecosystem.
Answer:
D, Cholera and Dysentery
Explanation:
Colds travel through contact and air. Tetanus infects through metal.
Answer:
1 unit
Explanation:
Each tropic level gets 10% of the energy from the last level it consumed.
Explanation:
<u>System</u> is a combination of several organs that perform together for a common function.
Hope it will help :)❤
