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Lena [83]
3 years ago
15

Indicate what type of external defences are overcome when the following infections occur:

Biology
2 answers:
just olya [345]3 years ago
5 0
The answer gotta be C & d . Most likeyly
adoni [48]3 years ago
3 0

Answer:

  • malphigian layer of the body,,,in the intenstinal part the part affect is intestines,,a respiratory infection,,lungs are infected,,an infectiona in vagina,, the genital part of the body is affected,,,,

Explanation:

  1. sentences,,people with allergy can be given vaccine antigen to counter the alogen,,2 when she got an accident his lymphocytes antibodies were affected
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Which cells are responsible for the movement of photosynthates through a plant?
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Answer:

sieve-tube elements, companion cells

Explanation:

Sieve-tube elements and companion cells are responsible for the movement of photosynthes through a plant.

The sieve tube elements are shorter (almost organelle-free) living cells, placed end to end, forming the sieve tubes. Their transverse cell walls are called sieve plaques that make connections between cells and through openings called sieves establish the connection between the cytoplasm of adjacent cells.  Each sieve is coated with calose (glucose polymer), which in winter can completely clog the vessel and then dissolve in spring. When infections occur or the vessel is parasitized, it can also be clogged with callose.

Companion cells are specialized parenchymal cells, which contain all the components that exist in living cells, including the nucleus, are the cells most closely linked to the sieved tube element. The Screened Tube Element and its companion cells are related in development, are derived from the same mother cell, and have several cytoplasmic connections to each other. Due to the many connections, the potential function of the companion cells is to release substances into the sieved tube element and, when the nucleus is absent, to include information molecules, proteins and ATP. When a screened element dies, its companion cells also die, which is a demonstration of this interdependence.

8 0
3 years ago
When did arundant fossil evidence first appear in the geologic record
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<h2>540 million years ago </h2>

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Era immediately follows Precambrian It lasted about 4.5 billion years.

When did abundant fossil evidence first appear in the geologic record.

540 million years ago.

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