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Otrada [13]
2 years ago
15

Helper t cells are activated by ________ on ___________ cells

Biology
1 answer:
inessss [21]2 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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A culture medium consisting of agar, human blood, and beef heart is a A) Chemically defined medium. B) Complex medium. C) Select
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A culture medium consisting of agar, human blood, and beef heart is a

B) Complex medium

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All of the following are characteristics of modern amphibians except:
Tom [10]

Answer:

Endothermic

Explanation:

Amphibians are ectothermic organisms. Ectothermic animals are coldblooded animals. From the options above, the correct answer is endothermic because amphibians are not hot blooded and are never endothermic.

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What embryonic structure gives rise to the centrum?
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Life is the answer to your question

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Schizocoelic development

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In the schizocoelic development of the embryo, the coelom, called the schizocoel, develops as a split in the mesoderm. The outer layer of the mesoderm attaches with the ectoderm to form a body's musculature, while the inner layer attaches with the endoderm to form the wall of the digestive tract. 

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