Answer: depending on the type of chromosomes a and b could be pericentric and paracentric inversions
C. Tandem duplication
D. Reverse tandem duplicate
E. Deletion
Explanation:
In an acrocentric chromosome, a is a type of paracentric inversion which does not involve the centromeres while b is a form of pericentric inversion which involves the centromere. Doubling a particular segment on the chromosome refers to a tandem duplication. Removal of a segment indicate deletion.
Explanation:
As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today's atmosphere. After about half a billion years, Earth's surface cooled and solidified enough for water to collect on it.
Oxygen plays a critical role in respiration, the energy-producing chemistry that drives the metabolisms of most living things. We humans, along with many other creatures, need oxygen in the air we breathe to stay alive. Oxygen is generated during photosynthesis by plants and many types of microbes.
Answer:
A downhill
Explanation:
A runoff happens when water drags sediment from a rock over a sloping terrain. Thus, water drags the eroded fragments of a rock in favor of gravity, pushing these fragments downwards. This is very common in mountainous and steep regions, without vegetation cover, where erosion caused by runoff is very high.
It is C. This thing is making me write at least 20 characters so...
