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adoni [48]
3 years ago
11

Unless a series of sedimentary rock layers has been overturned, which layer is usually the oldest?

Biology
2 answers:
artcher [175]3 years ago
6 0

Answer: The bottom layer.

Explanation: The oldest layers are located at the bottom of the sedimentary rock while the youngest layers are found at the top of the rock. Sedimentary rock most times contains a lot of fossils, they constitute of organisms that have once-lived.

Xelga [282]3 years ago
5 0

the layer on the top. the layer with the most minerals.

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<u>The four types of interactions in communities are:</u>

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The type of interaction in which both the species involved are benefited, it is called mutualism.

<em>Parasitism:</em>

The type of interaction in which one species is benefited, whereas the other is harmed, it is called parasitism.

<em>Commensalism:</em>

The type of interaction in which one species gets benefited without harming or providing benefits to others is called commensalism.

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The type of interaction in which both species lose is called competition. It is opposite of mutualism.

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Ede4ka [16]

Answer:

The correct answer is e. All of the above.

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Sister chromatids are made during the synthesis phase of the cell cycle. In the synthesis phase, the homologous chromosomes get replicated and sister chromatids are produced so they are produced by duplication of chromosomes.  

As sister chromatids are produced by replication, therefore, they are identical copies of parent chromosomes. These sister chromatids are joined to each other at centromere. They get separated during the anaphase of mitosis and moves to the opposite pole.

Therefore the right answer is e.

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