Answer:
A mutation.
Explanation: When a cell mutates is will be permanently changed.
<span>Answer: the genes for the two traits assort independently.
The proportion </span><span>9:3:3:1 is found when studying two genes at the same time,</span><span> known as a dihybrid cross.
Mendel did this cross and found that the offspring, had 4 different phenotypes, but in different quantities . </span>This ratio led Mendel to develop the law of independent assortment.
A sound wave is a wave of compression and rarefaction, by which sound is propagated in an elastic medium such as air.
Answer:
The answer is natural selection
Explanation:
The modern theory of evolution was developed by Charles Darwin, an amateur English naturalist, in the 19th century
Plastic. (Petroleum can provide the raw material for making plastic)
