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Otrada [13]
3 years ago
15

Helper t cells are activated by ________ on ___________ cells

Biology
1 answer:
inessss [21]3 years ago
5 0
Helper T cells become activated by interacting with antigen presenting cells. and the second blank space is either cytotoxic t cells or B cells
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Consider a breeder that mates two heterozygous black Staffordshire bull terriers over the course of three years. The dam eventua
Lilit [14]

Answer:

Different colour occur due to heterozygous nature.

Explanation:

Most of the puppies just like parents because the black colour gene or allele is dominant over other colour allele whereas other colour puppies also formed due to presence of heterozygous type of alleles. Other colour occurs due to appearance of recessive allele in the physique of the offspring or formation of hybrids occurs which causes colour other than black and white in the offspring. In the F1 generation all the offspring resembles to the male parent but after this generation some offspring resembles to male, some are hybrids and other resembles to female.

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2 years ago
What is fried miescher credited with?
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He is credited with the discovery of Nucleic Acids.
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drek231 [11]

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C

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4 0
2 years ago
Global bee populations have been declining over the past decade. What impact might this have on the world's human population?
aev [14]

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Bees play a significant role in the field of agriculture. They can adapt to the process of pollination. Pollination is usually defined as the process of transportation of pollen grains from the male anther of a flower to the female stigma. The bees pollinate the crops and increases their productivity and yield capacity. About 35% of the food that we eat, are dependent on this pollination act that is carried out by the bees, involving either directly or indirectly.

Over the last few decades, the population of the bee has been decreasing, and it is directly affecting the global human population. It is because less amount of food is produced compared to the rate of demand, resulting in a shortage of food items.

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