Prostate Gland is a<span> single, doughnut-shaped gland about the size of a chestnut or golf ball.</span>
Answer: How does taxonomy help us understand relationships among organisms on Earth? Taxonomy is about classifying organisms into related groups, and drawing up trees of common descent, from the shared ancestors from which the branches separated
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DNA polymerase
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I learned about this before and I believe that this is the answer.
To answer this question, subtract from the total population of 1000 the homozygous dominant (DD) frogs of 280 and the homozygous recessive (dd) frogs of 220, and you are left with 500 frogs that by default are <span>heterozygotes (dD). The frequency of these frogs would be 500/1000 = 0.5</span>