Cool? what kind of question is that?
Answer:
Skin acts a defensive and protective layer. It protects the internal body from pathogens, which are disease causing bacteria. The skin can fend off bacteria, particles, foreign bodies, etc.
Explanation:
It's the neuron which helps transmit the neural messages from one part of the body to another.
Answer:
Mutations must not occur to introduce new alleles to the population. No gene flow can occur to increase variability in the gene pool. A very large population size is required to ensure allele frequency is not changed through genetic drift. Mating must be random in the population.
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The correct answer of the given question above would be option C. The one that contains stem cells that can produce only their own type of cells would be an adult. It is only an adult has the ability to reproduce another offspring, and this offspring has the same type of cells. Hope this answers your question.