Chromosomes are pieces of tightly packed DNA that prove useful in copying DNA for mitosis.
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Answer:
The last time levels of atmospheric carbon dioxide were this high came during the Pliocene Epoch, which extended from about 5.3 million to 2.6 million years ago.
Explanation:
the tree is 24 years old. The inner part of the stem of the tree has a part referred to as cambium. Each year cambium produces high number of cells with thin cell walls when tree is highly active. These cells form the light-colored rings. When tree is less active cambium synthesizes few small cells with thick walls. The region occupied by these cells appear as a darker ring on the cross section of the stem. These two processes occur in the same year and as result each growth year is characterized by a ring consisting of a light and dark parts.
Answer:
<h2>Photosynthesis requires energy to build organic molecules.</h2>
Explanation:
Photosynthesis requires energy to build organic molecules.
Remove brackets before and after requires and comma in the sentence, it will be correctly punctuated as above.
