Because for the strands to form a double helix the base pairs have to match perfectly (adenine with thymine and cytosine with guanine) in DNA , and if a strand of RNA is paired with a split strand of DNA it goes adenine with uracil and cytosine with guanine (uracil replaces thymine)
Answer:
The population history of the island remains highly controversial. In addition to internal conflict, the population crash has been attributed to “ecocide,” in which the Island's resources were exhausted by its inhabitants, reducing its ability to support human life.
Explanation:
Continental drift is destroying the Earth's crust. Because the continents are slowly moving the earth's crust is stating to crack or create volcano's.
Answer:
D. A dairy cow produces milk over several years
Explanation:
A dairy cow is reared mainly for milk production and the cattle normally produces lots of milk as long as it’s well fed. This usually goes on for several years and provides income throughout that period and can then be used for beef purpose later on .
The beef cattle is usually slaughtered and the beef used immediately and has no long term use.
This is why dairy cow brings in more income than a beef cow.
