How does one gene have several versions of itself

What structure in the earthworm has a similar function as the human heart? Explain your answer.

Choose the answer that shows the cross between roan and white cattle

In purebred Labrador retrievers, the dominant fur-color allele, B, results in black fur, and the recessive allele, b, results in yellow fur. Suppose the Happy Labrador Ranch breeds yellow and black Labrador retrievers.

An animal without a body cavity is called

What changes happen in cancerous cells

Was there only one specific mRNA codon for each amino acid?

Experimental Design: As you are walking down a wooded path, you notice a large depression in the ground that has burn marks along the outside. What caused the hole?

Name the 4 major groups of organic compounds

During his lifetime A Redwood will become larger and more complex. It could be Alive because it displays which sign of life

1) Social media and technology have given teenagers more ways to act negatively toward each other. 2) Teens say they believe social media has a positive impact on their lives, with some reporting that it makes them feel "depressed, less popular,