II and III only. The Cambrian Period is the first geological time period of the Paleozoic Era. And the longest unit in geological time is the supereon.
Explanation:
<em>Mitochondrial DNA typing</em><em> </em><em>-</em>
This method is mainly used by forensic scientist who investigate crime scenes.
It involves the use of DNA from an unknown sample to match a DNA collected from a crime scene.
This method is normally used in special scenarios.
These scenarios include:
1) When the DNA is discarded.
2) When the sample does not contain nuclear DNA.
From the description above we can now answer the question as follows:
an unknown nuclear mtDNA is matched to a nuclear mtDNA found at a crime scene.
The stomata and their guard cells allows this happen.
Stomata is like a hole or gap on a leaf, most of them are present in a bottom side of the leaf, since waxy cuticle is not present over there. And 2 guard cells make up a stomata.
Guard cells are able to control the size of the stomata, depending on the situation. For example, the guard cells close up during day time because a lot of sunlight may cause more water loss.
In conclusion, guard cells and the stomata are the main structures that allow carbon dioxide and oxygen (water too) diffuse in and out of leaves.
Answer:
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Explanation:
