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sergiy2304 [10]
3 years ago
15

The _________ is the site of the _________ which is the first site of hematopoiesis in the developing embryo.

Biology
1 answer:
Ghella [55]3 years ago
6 0

Answer: D

Explanation:

During embryogenesis, hematopoiesis begins in week 3 in the Yolk Sac, in Pander´s Island or Wolff´s Island, commonly known as the "blood islands". These blood islands develop from the umbilical vesicle, allantois, and chorion. In week 5, blood production starts on the fetal liver, and finally, at week 12 it begins in the bone marrow, spleen and, thymus.

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When sodium chloride is formed from a positively charged sodium atom and a negatively charged chlorine atom, the charge on the s
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  When  sodium chloride  is formed  from a positively charged sodium atom and a  negatively  charged  chlorine  atom,  the charge  on the salt becomes  neutral   is true

 Explanation

Sodium  ion ( positively  charged)  combine with chloride  ion ( negatively charged)  to  sodium chloride which  is neural  according  to equation below.

Na⁺   +  Cl⁻    →  NaCl  (<em>neutral</em>)

Equal  number  of positive  and negative  charges  add up to make neutral  Nacl therefore the statement above is true.


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3 years ago
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What term describes an allele that is masked or covered/dominated up by another allele?
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Answer:

B dominant allele

Explanation:

B is the correct answer, I just took the test

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.<br> Why are some sources of sugar better than others?
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Explanation:

\huge{\underbrace{\overbrace{\mathfrak{\pink{Answer:❣}}}}}

Whether an added sugar contains more or less fructose versus glucose has little impact on health. (An exception may be people with diabetes who need to control their blood glucose, in which case a higher-fructose, lower-glucose sugar may be preferable

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2 years ago
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1.A scientist wants to prevent a culture of live cells from producing a particular protein. Which of the following will the scie
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1. Answer:   A

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2. Answer: B

Explanation: Translation of genes into proteins is dependent on the sequence of nucleotides. They are translated in sequences of 3 nucleotides known  as codons. Therefore adding a nucleotide on a piece of DNA causes what is referred to as a frame-shift mutation. The 3 sequences (of codons) is interrupted and shifted by one nucleotide. Therefore, the codons change and the amino acids translated will also change.

3. Answer: A

Expanation: Producers are significant in a food chain because they incorporate the energy of the sun into the food chain. This is why they are at the base of the food chain and have the largest biomass. They are consumed by primary consumers which are consumed by secondary consumers which are consumed by tertiary consumers and so on.  

4. Answer: D

Explanation: Plants are consumed by herbivores. Therefore, a decrease in plant population due to drought was resulted to decrease in herbivore population. This is due to stiff competition by the herbivores for the scarce plant population. Carnivores consume herbivores. Due to a decrease in the herbivore population, then the carnivore population would also decrease.

5. Answer: A

Explanation: Burning of fossil fuels emits carbon dioxide gas which is a greenhouse gas. Greenhouse gas traps infrared wavelength of lights hence warming up the atmosphere, causing global warming. Reduction  in use of fossil fuels will hence alleviate an increase in global temperature hence protect coral in the oceans from bleaching.  

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In the 3rd line of defense blood vessels expand,
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