I believe the answer is C. E. And F.
<h3><u>Answer</u>;</h3>
Key
A sorting device that is useful in classifying by observation is a <u>key</u>.
<h3><u>Explanation</u>;</h3>
- <em><u>Classification key or taxonomic key is a device that is used by scientists to identify unknown organisms. </u></em>
- They are constructed so that the user gets a series of choices about the characteristics of the unknown organisms.Thus, by making the correct choice at each step, one is led to the identity of the specimen.
- Therefore<u><em>, keys can be used to identify a living organism or determine which group it belongs to</em></u> by answering questions on the key about characteristics of living things.
Answer:
<h2>A</h2>
Explanation:
1. As given, the of a strand DNA contain sequence;
A-T-G-C-C-A-T-C-G-G-T-A,
2. After exposure to UV light, the strand contain the bases;
A-T-G-G*-C-C-A-T-C-G-G-T-A,
3. By comparing both the strands, we find that, the strand of DNA after exposure to UV contain extra G nucleotide between G and C, which is resulted by an insertion.
So we can say that, a new base has been inserted.
In the earliest stages of development, all four organisms have a knobby head, gill slits, and a tail. These similarities tell us that all four of these organisms have a common ancestor.
One factor that has led to increased populations in dry areas is there is better technology that allows easier access to water supplies. The correct answer is C.
