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Aleksandr [31]
3 years ago
11

Distinguish between internal and. external respiration

Biology
1 answer:
Elena-2011 [213]3 years ago
3 0
External respiration is the exchange of O2 and CO2 between the body and the environment. It involves moving air in and out of the lungs and the exchange of gases between the alveoli and the blood capillaries. The gases must also be exchanged between the blood capillaries and the cells of the body. This is called internal respiration
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Nocturnal animals are important pollinators. What niche do they specifically fill?.
natita [175]

Answer:

Nocturnal animals are important pollinators. What niche do they specifically fill? They eat the nectars of angiosperm flowers.

Explanation:

3 0
2 years ago
_____ are frequent intense aches of the head or neck that are not caused by another physical disorder.
vlabodo [156]

Migraines are frequent intense aches of the head of neck that are not caused by another physical disorder. Severe pain may usually be felt on either one side or both sides of the head. Pain usually is felt in the temples. Migraine could last for hours or couple of days. 

5 0
3 years ago
Chargaff's Rule. If there is 20% Adenine in the cell, what is the percentage of Thymine, Guanine, and Cytosine found in the same
Ulleksa [173]

Answer:

A= 20%

G= 30%

T= 20%

C= 30%

Explanation:

Recall that the sum of all nitrogenous bases in the DNA nucleotide is equal to 100%. And specific base pairings of Adenine to Thymine (A=T), and Cytosine to Guanine (C=G) must be equal.

So, the percentage of Adenine equal thymine, and that of cytosine equals guanine.

Now, A + T + C + G = 100%

So, if Adenine makes up 20% of the DNA nucleotides, Thymine is also 20%.

Then, 20% + 20% + C + G = 100%

40% + C + G = 100%

C + G = 100% - 40% = 60%

So, divide 60% by 2 to obtain the individual percentage of cytosine and guanine. Each will take 30%

Finally, A= 20%; G= 30%; T= 20%; C= 30%

8 0
3 years ago
Read 2 more answers
Which tool would you use to predict the percentage of offspring that will have a specific trait?i need help
scoundrel [369]
Punnett square predicts the percentage of offspring
5 0
3 years ago
A student states that petrification occurs when pore spaces in an organism's remains are filled with minerals that precipitate o
Cloud [144]

Answer:

C. Both A and B describe errors in the statement.

Explanation:

In fossilization i.e formation of fossils, two terms are used as follows: permineralization and petrification.

- Permineralization is a process whereby the pore spaces of an organism's remains are filled with mineral matter that precipitates from lake and ocean solutions.

- On the contrary, petrifaction or petrification is the process whereby a once-living tissue (matter) are REPLACED by minerals, hence, preserving the organism's structure by turning it into a stone (petros).

According to this question, the student mixed up their definitions by giving the definition of permineralization instead, however, options A and B have described the errors associated with the statement.

7 0
2 years ago
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