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Phoenix [80]
3 years ago
15

How do scientists mark the end of a geologic era and beginning of the next?

Biology
2 answers:
erastova [34]3 years ago
5 0

Answer:

Scientist usually mark the end of a geologic era and the beginning of the next by mass extinction or drastic changes to the earth.

Explanation:

hope this helps

AnnZ [28]3 years ago
4 0

Answer:

Scientists mark the beginnings and the ends of eras by observing extinctions and appearances of species in the fossil record. The appearance of various species of ammonites, belemnites, trilobites, foraminifera, nannofossils and magnetic events also mark the boundaries of many of the defined eras.

Explanation:

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ValentinkaMS [17]

Answer:

C) They are part of a community

Explanation:

A community represents the sum total of populations of different species present together in an area or ecosystem. In a community, the organisms of these different species may benefit or harm each other and exhibit little or more interdependence. In the given example, beer, insects, ants, chipmunks represent the organisms of different species that are present together in a habitat. They interact with each other in various ways. For instance, the bear is a predator of insects.

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3 years ago
What is the safest way to carry a microscope? one student should hold onto the base and one student should grasp the arm. two st
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4 years ago
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Answer:

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Explanation:

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When the RB gene is mutated or it is deleted already on any one of a homologous chromosomes, then only one hit rather that two which is needed to cause the development of retinoblastoma and hence the probability is of retinoblastoma to occur is higher in the individuals who have already inherited the RB deletion and also have a genetic predisposition for the retinoblastoma.

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They appear larger than they really are.
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3 years ago
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