<span>the record of descent of an animal, showing it to be purebred.</span>
Answer:
Explanation:
Environmental factors can influence natural selection because they can increase or decrease. ...
An increase in food and a decrease in predators would most likely genetic variation in a population. ...
In a few generations, this population of beetles changed.
Answer:
It depends on how bad the damage is
Explanation:
Explanation:
Primary cell walls are synthesized during growth and typically are relatively thin, pliant, highly hydrated structures. ... Secondary cell walls provide strength and rigidity in plant tissues that have ceased growing.
Answer:
The correct answer is 4.6 percent.
Explanation:
The Oort cloud refers to the clouds of icy objects, which is present in the outermost section of the solar system. These are the disperse layer of clouds found in the external layer of the solar system.
In the given question, it is given that the number of comets in the Oort cloud is 10^12 comets.
The number of comets getting close towards the Sun is 10 comets in a year.
The age of the solar system is 4.6 * 10^9 years
The number of comets used since the start of the solar system is,
(4.6 * 10^9 years) (10 comets/year)
= 46 * 10^9 comets
Thus, the number of comets disappeared since the beginning of the solar system is 46 * 10^9 comets.
The initial number of comets at the start of the solar system is 10^12 comets.
The percentage of comets that are used up are:
(change in no of comets) / (initial no of comets) % = (46 * 10^9 comets) / (10^12 comets) * 100
= 4.6 percent.
