A graph of atmospheric carbon dioxide concentration over time is shown. Scientists are investigating the cause of the large increase in atmospheric carbon dioxide concentration since about 1800. Which of the following provides the best explanation for the increase of carbon in our atmosphere? A. Frequent eruptions of large volcanoes.
B. Naturally occurring fluctuations of in the carbon cycle.
C. Utilization of fossil fuels by humans for industrialization.
D. An increase in the sea level due to melting of ice.

C. Utilization of fossil fuels by humans for industrialization.

Explanation:

Frequent eruptions of large volcanoes were happening long before humans and will happen after humans too. They are not the reason why we are seeing so much CO2 in the last 200 years.

There are some naturally occurring fluctuations of carbon but not to the degree that we are seeing.

Melting of ice and sea levels rising is due to the global warming problem caused by our dependency on fossil fuels.

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

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