Answer:
Demography is the statistical study of human populations. Demography examines the size, structure, and movements of populations over space and time. It uses methods from history, economics, anthropology, sociology, and other fields.
The mRNA strand is complementary to the DNA template strand; however, uracil instead of thymine is paired with adenine.
<h3>What is RNA?</h3>
This is referred to as ribonucleic acid with its base adenine being paired with uracil.
The mRNA strand which is known as messenger RNA is complementary to the DNA template strand and carries protein information from the DNA to cytoplasm for appropriate translation.
Read more about mRNA here brainly.com/question/12388408
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It's actually A. Vertebrate have a hard out shell.