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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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When food becomes scarce, hundreds to thousands of independently living
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Answer:

The correct answer is - tissue.

Explanation:

In an unfavorable condition like scarcity of food, individual unicellular organism amoeba makes a formation a multicellular mass by aggregation of the cells that reproduce when conditions become favorable. These aggregation of cells known as slime molds.

These molds are more similar to the tissue structure in the hierarchy of organization of a multicellular organism. The tissue is the organization level that is similar to this mass as it is also formedby the cells joined together to perform a particular function.

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Complete the chart please
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Mitosis - Asexual, diploid, 1, 2, during the synthesis phase.

Meiosis- sexual, haploid, 2, 4, during the synthesis phase.

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Witch one of earths layers are the thinnest
mars1129 [50]
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Why are there many separate ecosystems in a rain forest?
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Oxygen is produced at what point during photosynthesis?
Studentka2010 [4]
C when water is split
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