I'm assuming your test is done by now, but the answer is B. An ion forms when an atom has a positive or negative charge. In other words, an atom is an ion whenever the amount of protons and electrons are unequal.
Answer;
Mitochondria and chloroplasts contain their own DNA.
Explanation;
-Mitochondria and chloroplasts have striking similarities to bacteria cells. They have their own DNA, which is separate from the DNA found in the nucleus of the cell.
-From the Endosymbiotic theory, even though both organelles are found in eukaryotic cells, both mitochondria and chloroplast have characteristics often found in prokaryotic cells. These prokaryotic cell characteristics include: an enclosed double membrane, circular DNA, and bacteria-like ribosomes.
The observed changes in the allele frequencies over time is led by an important evolutionary process termed as genetic drift; option C.
<h3>What is genetic drift?</h3>
Genetic drift refers to the random changes that occur in the allele frequency of a population of organisms over time.
Therefore, it can be concluded that the changed that occurred in the allele frequency of the organisms is due to genetic drift.
Learn more about genetic drift at: brainly.com/question/1027688
#SPJ1
