Answer:
Pioneer species/organisms help modify the environment because they are the first organism to live on that "terrain" or environment and they open up the chance to make more organism, also when they die and decompose they make more soil so that more organisms can grow.
Explanation:
<span>Genetic variation can be caused by mutation (which can
create entirely new alleles in a population), random mating, random
fertilization, and recombination between homologous chromosomes during
meiosis (which reshuffles alleles within an organism's offspring)</span>
D. Always be nice to the patient and assure them you are capable.

<h2><u>TRUE</u></h2>
- <u>system of layout refers to the designs of planting trees.it is desirable planted in a systemic way</u>
<h2><u>hope</u><u> it</u><u> helps</u></h2>