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densk [106]
3 years ago
13

Loretta and her friends want to find out which of their pets can run the fastest. Which kind of scientific investigation should

they use?
A.

a controlled experiment

B.

development of a model

C.

a review of existing work
Biology
1 answer:
antiseptic1488 [7]3 years ago
3 0
They should do A, a controlled experiment
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A DNA strand consists of two polynucleotide chains, composed of four nucleotide subunits. Each of these chains is known as DNA strand. Hydrogen bonds between the base portions of the nucleotides hold the two chains together. DNA nucleotides are composed of a 5-carbon sugar (Deoxyribose) to which are attached one phosphate group and a nitrogenous base (Adenine, Guanine, Cytosine and Thymine). The nucleotides are covalently linked together.

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