<h2>
Answer:</h2>
<u>D. All of the above
</u>
<h2>
Explanation:</h2>
Precambrian time incorporates Earth's history from birth up to 590 million years back. That is, the Precambrian traverses 90% of Earth's presence. Fossilized microscopic organisms and blue-green growth demonstrate that crude life existed in any event 3,500 million years prior, and potentially prior.
However, it took another 2,100 million years for eukaryotic cells (plant and creature cells) to show up. These single-celled animals (protozoa) commanded the seas. Multi-cell creatures (spineless creatures) didn't advance until exceptionally late in Precambrian time, around 700 million years prior or 2,800 million years after life initially started on Earth.
The factor, in addition to the mass, buoyancy and persistence of these materials, that would be critical in studying their motion is ocean circulation.
<h3>
What is plastic pollution ?</h3>
Plastics pollutants has an immediate and lethal impact on wildlife. Thousands of seabirds and sea turtles, seals and different marine mammals are killed every year after eating plastic.
Because chronic natural pollution withinside the marine surroundings connect to the floor of plastic particles, floating plastics withinside the oceans were located to build up pollution and delivery them thru ocean currents. Floating and migrating plastic particles has additionally been located to move invasive marine species.
Read more about the pollution :
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Natural selection. Only spiders that were more resistant to the pesticide lived through the first spraying of the pesticide, thus we're the only ones that could reproduce. This in turn made the offspring of the previous generation more resistant as well; thus making the pesticide less effective.
Answer:
Incidence of cystic fibrosis on the island= 0.0025
Explanation:
According to the given information, the population is in Hardy Weinberg equilibrium which means that the allele frequencies would be maintained over generations.
Given that total population size is = 20
Total number of alleles = 20 x 2 = 40 (since human are diploid, each individual has two alleles for one gene).
Out of total 19 people, only two are heterozygous for cystic fibrosis which means that out of total 40 alleles, the number of recessive allele for cystic fibrosis is = 2
Frequency of recessive allele (q)= 2/ 40 = 0.05
Frequency of cystic fibrosis genotype (q^2) = 0.05 x 0.05 = 0.0025
Therefore, incidence of cystic fibrosis on the island would be = 0.0025
Your answer is B. Good luck with the rest of your homework!
