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dangina [55]
3 years ago
8

What are the four factors demographers look at to determine population size

Biology
1 answer:
ankoles [38]3 years ago
6 0

Sampling

- counting the number of organisms in a small area and multiplying to estimate the number in a larger area

Mark & Recapture

- capture an organism & release it to remix with population. Then recapture some more in that area to determine population size. Formula is as follows: R (marked recaptures) / C (total in second sample) = M (marked initially) / N (total pop. size)

Indirect Observation -

estimating the population size by tracks, nest or other animal signs in an ecosystem.


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Anna71 [15]
<h2>Solution:</h2><h3>Given data:</h3>

d= 20g/cm3

m= 10g

formula: d= m/v

By rearranging the formula according to our need:

v= m/d

by putting the values in the formula

v= 10g/20g/cm3

v= 0.5L

So, a rock that has a density of 20g/cm3 and a mass of 10 g would have the volume of 0.5L.



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3 years ago
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The cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons are the
Harlamova29_29 [7]

Answer:

The correct answer will be option- D.

Explanation:

Neurons are the cells which help in the transmission of the signals to and fro from the CNS and PNS to the body and vice versa. The structure of the neurons is divided into three main parts: the axon, dendrites and the cell body. The dendrites and axons are the extensions of the cell cytoplasm and together constitutes the neurites.  

The dendrites are the extensions of the cytoplasm which receives the signals either from the cell surface as well as the from the post-synaptic neurons and further process the signals.

Thus, option- D is the correct answer.

7 0
3 years ago
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nika2105 [10]
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At the center, 8 unmarked red balls are interspersed with 6 blue balls marked with plus signs. A green cloud with 2 concentric w
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Explanation:

got it right on Edgenuity

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