Answer:
The mouse and shrew bones were common to all three owls so they were not useful in identifying environments. The gopher bones were unique to the great grey owl of Alaska. Gophers are rodents that are successful in areas with soft soil and lots of grass, so the gopher and this owl would be found in the meadows and evergreen forests of Alaska. The bat was unique to the barking owl of Australia. The bat would be found in woodland habitats where there are many trees the bat can hang from. The gull bones were unique to the short-eared owl of Cuba. Gulls are wetland birds, so the gull and this owl would be found in marshes and coastal areas.
Crossing over contributes to genetic variation by exchanging chromosomal segments between non-sister chromatids of homologous chromosomes.
What is crossing over?
- Crossing over is the exchange and recombination of genetic components between the homologous chromosomes.
- This occurs in the pachytene stage of the meiosis-1 of the meiotic division.
- Crossing over occurs with the help of an enzyme and the enzyme responsible for crossing over is called Recombinase.
Thus, crossing over contributes to genetic variation by exchanging chromosomal segments between non-sister chromatids of the homologous chromosomes.
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Answer:
D
Explanation:
A stomata is responsible for opening up, to allow gas exchange which is needed for photosynthesis .
Answer:
Answer is embolism.
Explanation:
Embolism can simply be explained as a critical or serious medical condition which occurs is an obstruction s when there is an obstruction of a blood vessel such as the artery. This means that, the artery becomes blocked because of a foreign substance , usually blod clot which travels through the blood stream.
Note that, when a blood clot travels through the blood stream to the brain, it can result to embolic stroke.
Some of the things that can lodge in the blood vessel to cause blockage are fats from the marrow, air bubbles and collagen.
B. the bond forms when electrons are shared
