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Softa [21]
3 years ago
8

What does it mean to have similar embryos?

Biology
1 answer:
Ira Lisetskai [31]3 years ago
5 0

Answer:

Signposts that determine the fate of cells.

Explanation:

Embryos for humans and other animals often look alike at certain developmental stages because they share ancient genes. This expression means that a more advanced organism, like humans, will resemble less advanced species during it's development stages.

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Natural selection, in this case, favors the individuals that are able to adapt the fastest to the changing conditions. 
4 0
2 years ago
In a two-compartment model of a cell with a K - and Cl --permeable membrane and a 10-fold excess of KCl in the inside compartmen
Keith_Richards [23]

Answer:

When the solutions (including inside and outside) were replaced by NaCl, the membrane potential changes from a negative value of -60 mV to a positive value of + 60 mV.

Explanation:

According to the Nernst equation the potential of the membrane for a two-compartment model of a cell for positive gradient of K⁺ ions is V = - 60 mVlogK'/K where K' = inside concentration of K⁺ ions and K = outside concentration of K⁺ ions. For a 10 fold excess of KCl in the inside compartment, K'/K = 10. So,

V = - 60 mVlogK'/K = - 60 mVlog10 = -60 mV.

For a negative gradient of Na ions is V = + 60 mVlogK'/K where K' = inside concentration of Na⁺ ions and K = outside concentration of Na⁺ ions. (Since the cell is selectively permeable to Na⁺ ions. So, Na ions to not flow out but in.)For a 10 fold excess of NaCl in the inside compartment, K'/K = 10. So,

V = + 60 mVlogK'/K = + 60 mVlog10 = +60 mV.

So, when the solutions (including inside and outside) were replaced by NaCl, the membrane potential changes from a negative value of -60 mV to a positive value of + 60 mV.

8 0
2 years ago
Earth has one moon and Mars has two moons. How many more moons are found around the outer planets than the inner planets?
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Does this help?https://spaceplace.nasa.gov/how-many-moons/en/
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The electron degeneracy pressure keeps white dwarf stars from collapsing in on themselves.
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the answer to this question is all of these (a,b,c)

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