B is the correct answer :))) took bio last year
Answer:
Climate Change: Atmospheric Carbon Dioxide. The global average atmospheric carbon dioxide in 2018 was 407.4 parts per million (ppm for short), with a range of uncertainty of plus or minus 0.1 ppm. ... Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.
The ecosystem is indeed huge, the one who are creating in the ecosystem are animals and plants both are the one who creates the ecosystem.
The interactions that occur between organisms in an ecosystem: Predation, parasitism and herbivory.
Predation - Predating another animal for a prey
E.g : Lions And Antelopes
Paratism - Some small things that lives with the host, it can harm the host or harm the parasite.
E.g: dogs and lice or bacteria and humans
Herbivory - animals that eat plants
e.g: Sheep And the grass
Glad I can Help!
For protection from the outside elements & harmful insects I would assume. Unless that's already obvious & they wanted a more in-depth answer.
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.
