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Can a Vector be a Human?

Yes or No and explain please

Vector Definition:

An organism, typically a biting insect or tick, that transmits a disease or parasite from one animal or plant to another.

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Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?