Answer: A
Explanation: It makes the most sense because it isn't directly speaking about something, it is mainly summarizing the main idea. I'm not 100%, but that's the one I would choose if it were me. Hope I helped out a little!
Trace fossil because a trace fossil is a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
A single stranded DNA (oligonucleotides) can hybridize with (d) both complementary DNA and complementary RNA.
DNA is the Deoxyribonucleic Acid. It is the genetic material present in majority of organisms. The nitrogenous bases present in DNA are: Adenine, thymine, Guanine and Cytosine. DNA is a double stranded structure hence it forms hydrogen bonds with a complementary strand. The complementary strand can be of a DNA or RNA.
RNA is the Ribonucleic Acid. It also is a genetic material present in very few organisms. RNA is less stable than the DNA and may be either single stranded or double stranded. The nitrogenous bases of RNA are: Adenine Uracil, Guanine and Cytosine.
To know more about DNA and RNA, here
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All viruses have a capsid or head region that contains its genetic material. The capsid is made of proteins and glycoproteins.
My teacher always taught me the saying "(A)pples on (T)rees, (C)ars in (G)arrages, meaning that A always went with T and C always goes with G
When that applies here, 30 Red, or Adenine legos would go with 30 Thymine legos, which is the color orange
30 reds would go with 30 oranges in this case
