Answer:
The Bottom Left corner graph has the longest waves.
Explanation:
The waves are spread out and have a huge distance in between each crest.
The longer the wave, the less amount of energy being emitted. The shorter the wave, the more energy that is being emitted.
#teamtrees #WAP (Water And Plant)
The action of restoring the flow of blood to an organ or tissue, typically after a heart attack or stroke. (Definition from google)
Answer:
The correct answer is b. must be present in a population before natural selection can act upon the population
Explanation:
Genetic variation can be caused by mutation, recombination between chromosomes during meiosis and by fusion of two genetically different gametes during sexual reproduction.
This genetic variation is necessary for the evolution of any population. Natural selection acts on every individual and it decreases the frequency of those alleles that are not suited for the environment and increase the frequency of those alleles which helps the individual to survive in the changing environment.
Therefore genetic variation must be present in the population before natural selection act on the.
Having regular leaves would cause cacti to die faster due to the climate. Leaves are thin and dry easily without water. Cacti do not need leaves because it is a body