Variation means difference in genetic makeup between individuals within a specie.
Diatoms contain chloroplasts that have four membranes. These four membranes are evidence of secondary endosymbiosis (Option c).
<h3>What is secondary endosymbiosis?</h3>
Secondary endosymbiosis is a hypothesis used to explain why diatom chloroplasts have four membranes.
According to this hypothesis, diatoms received different genes from distinct photosynthetic and non-photosynthetic ancestors.
The acquisition of genes of different ancestors led to diatoms having chloroplasts with four membranes.
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Answer:
1) About 8.7 million.
2) They are being found everywhere.
It is Prophase.
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~Bob Ross®
Trichomoniasis is caused by a protozoan parasite that causes a mal/odorous frothy yellow to green discharge, itching (pruritus), and burning.
<h3>What is Trichomoniasis?</h3>
Trichomoniasis is a disease caused by a parasite whose symptoms are hugely variable among different persons.
Trichomoniasis is caused by the protozoan <em>Trichomonas vaginalis</em>, which infects suitable human hosts.
Trichomoniasis is a serious-mid disease and it must be treated properly in medical settings.
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