Which of the following is not a negative factor of nonnative species?

a.
Disrupt the natural variability of native ecosystems
b.
Do not co-evolve with native species
c.
They clog propellers that boats use for propulsion
d.
They lack natural predators that help control their population
e.
Hybridize and form a sturdier species

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

wait any answer choices plz

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).