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ale4655 [162]
2 years ago
6

What is a pure substance?

Biology
2 answers:
givi [52]2 years ago
8 0

Answer:

option C is the correct

ser-zykov [4K]2 years ago
6 0
B



if yoy have notes…
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Which of the following movements of ocean water has the greatest direct effect on the growth of producers?
andrew-mc [135]
I believe the correct answer is upwelling. Lets say we have producers such as plankton. well upwelling currents bring dead matter from the ocean floor up to the surface, creating plankton.
4 0
3 years ago
50 points!!! please define the philogenetic species concept and please explain it with an example, it's realy urgent
pickupchik [31]
Phylogenetic species concept (PSC) The concept of a species as an irreducible group whose members are descended from a common ancestor and who all possess a combination of certain defining, or derived, traits (see apomorphy). ... "phylogenetic species concept." A Dictionary of Biology. .

Or

The biological species concept has its limitations (although it works well for many organisms and has been very influential in the growth ofevolutionary theory). ... In thisexample, Ensatina salamander lineages A and B are separate species.Each has a common ancestor that individuals of other species do not.

I hope that this helps you out

4 0
3 years ago
Read 2 more answers
Robins typically lay four eggs. Four eggs allow the offspring to be well fed, whereas larger clutches may result in malnourished
Amanda [17]

Answer:

Stabilizing selection

Explanation:

The process of natural selection selects a species in one of the three ways: stabilizing selection, directional selection and disruptive selection.

During the process of stabilizing selection, nature does not favour the extreme phenotypes of the population but the intermediate phenotype with the maximum number of population.

In the given question, the Robin laid four eggs, neither more than four nor less than four which could have more disadvantages than the advantages.  Since the intermediate number of eggs is favoured by nature therefore the stabilizing pattern is observed.

Thus, Stabilizing selection is correct.

4 0
3 years ago
What is the connection between the liver (organ), UV radiation (sunlight), and bone tissue? I need something with more informati
joja [24]
The connection between them is Vitamin D.

Vitamin D can be obtained from food and supplements, or synthesized by our bodies when we receive UV radiation in our skin, which is our major source. However, this vitamin comes <span>inactivated</span> and the only way to activate it is through enzymatic conversion (hydroxylation) in the liver and later in the kidneys.

 This vitamin is necessary in the intestines because allows calcium and phosphorus to be observed, leading to normal growth and development of bones and teeth. Without enough vit D, bones become fragile, causing osteoporosis.

5 0
3 years ago
What is the relationship between micrometers and millimeters?
olga2289 [7]

Explanation:

1000 micrometer=1millimeter I.e.micrometer is 1000 times smaller than 1 millimeter

6 0
3 years ago
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