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Rashid [163]
3 years ago
12

Which structure is not present in all organisms?

Biology
1 answer:
ELEN [110]3 years ago
5 0

A plasma membrane  Hope it helped.

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sexual selection in males usually results in an increased ability to for mates, whereas sexual selection in females usually invo
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Disparities in mate attraction that alone account for differences in reproductive success An important aspect of evolutionary biology is sexual selection. The nature and scope of sexual selection, however, have been debatable since Darwin first proposed the idea of it.

Recent debate has brought the fundamental topic of what sexual selection actually is back into focus. Incorporating female-female reproductive rivalry into sexual or natural selection is one example of this.

Sex roles are determined by differences in gametes: men generate significantly more plentiful, smaller, motile gametes whereas females produce relatively fewer, more nutritious, often non-motile gametes. There will be an excess of male gametes that will not fertilize any eggs since just one gamete of each kind is necessary to generate a child.

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CAMP is a second messenger, used for intracellular signal transduction, such as transferring into cells the effects of hormones like glucagon and adrenaline, which cannot pass through the plasma membrane. It is also involved in the activation of protein kinases.
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What is the basis of the metric system of measurement?
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Example: 1 micro-Newton (a tiny force) is 1 kilogram-meter per second squared times 10^-6.

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the cell theory explains & states this

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