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natulia [17]
3 years ago
9

With advancing age, the lymphatic system ________.

Biology
1 answer:
Pepsi [2]3 years ago
4 0

The right answer is D (less responsive to antigens)


It is proven that, after puberty, thymus activity (an organ that is included in the lymphatic system, producing T cells that pick up antigens) decreases and that in adult and aged people the thymus has no role. Work done in humans indicate that in fact the cellularity begins to decline from birth in favor of lymphocyte perivascular spaces and connective and adipose tissue, which leads to a decrease in the capture of antigens.

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True, diabetes can contribute to gum disease.
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A heterozygous tall pea plant is allowed to self-fertilize. The resulting F1 progeny are 25% homozygous tall, 50% heterozygous t
maks197457 [2]

Answer:

25% heterozygous tall

Explanation:

If we take the F1 generation as parents and let them self-fertilise, we have 4 crosses.

The first one for homozygous tall, then we have 100% AA.

The second and third one for heterozygous tall and we have 25% AA, 50%Aa and 25%aa for each of them.

The last one would be for dwarf, and we'll have 100%aa.

Adding all of them, we'll have

AA = 100 + 25 + 25 = 150%

Aa =  50+50 = 100%

aa = 100 + 25 + 25 = 150%

as we had 4 crosses, so dividing the total percentages by 4, we'll have,

AA = 37.5%

Aa = 25%

aa = 37.5%

:. The percentage of heterozygous tall would be 25%.

Hope it helps:)

8 0
3 years ago
if a single species of squirrel evolved over time into 2 species, each on opposite side of the grand canyon, what is this change
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Why does infrared light and heat increase as the concentration of c02 in the atmosphere increases
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Answer: because as CO2 acts as a green house gas is absorbing rather than reflecting the heat energy received where infrared radiation is simply radiation emited by heated /hot body

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Which compound is released by photosynthesis and used in aerobic respiration
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