Answer:
The trilobite is the oldest.
Explanation:
In general terms (disregarding specific examples), the lower the level in the stratosphere, the older it is. In this case, the lowest level is taken by the trilobite.
Note however, that this is not always the case, especially near edges of the plates. Sometimes plates shift, which can cause certain older fossils to be moved upwards, while newer ones are shifted downward, as one plate "eats the other". Territory creations, including valleys and mountains when plates crash into each other, can also shift where a fossil is located.
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Answer:
hydrogen, because organic compound consists of hydrogen
The effects on photodynamic therapy of cancer cells in vitro is that retinyl palmitate (RP) can be used 24 h before PDT to enhance its effects. RP is not mutagenic under irradiation with He–Ne laser.
HeLa cells with or without RP (retinyl palmitate) that was incubated with the cells for a short or long incubation period prior to PDT are typically used to test the effects of PDT (photodynamic therapy) using hematoporphyrin derivatives (HpD) as photosensitizer under He-Ne laser irradiation.
No photodecomposition of RP alone is visible, but a small amount is seen of in the presence of HpD under He-Ne laser irradiation is seen. No photomutagenicity is often seen under laser irradiation. HeLa cell viability can be dramatically reduced by RP alone. A 24 hour incubation period before PDT increased the cytotoxicity of PDT on HeLa cells.
Therefore, retinyl palmitate (RP) can be used 24 h before PDT to enhance its effects. RP is not mutagenic under irradiation with He–Ne laser.
Learn more about retinyl palmitate here:
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The Paleozoic era literally translates as the "time of ancient life"
<h2>Answer:</h2>
The light colored moths don't extinct but they become less in number due to natural selection.
<h3>Explanation:</h3>
<em>Natural selection is the phenomenon in the biology in which the group of organisms which is most suitable to the changing environment will survive and increase its population by reproduction while non suitable group will decrease in number due to low ability to cope with changing environme</em>nt.
In this question before industrial revolution, light color moths have very light places like lichens to hide themselves from the predators by attaching to light color lichens.
But after industrial revolution due to pollution white lichen die and the habitat for white moths become less and they are more visible to the predators.
That's why their number decreases and dark color moths increase in number.
