Which parts of the heart prevent backflow of blood in the circulatory system and allow the heart to work like a pump?

A.) atria

B.) valves

C.) ventricles

Describe how genes influence the development of traits.

Epm in horses is caused by what? protozoa mites insects ticks

For 2012, rank the type of materials in the waste stream to the percentage of municipal solid waste they compromise, by weight before recycling. Rank from 1 (highest percentage) to 5 (lowest percentage).

Which is correct about dna replication? dna polymerase can build dna from scratch. dna polymerase adds nucleotides in the 3' to 5' direction. the place where the parent dna becomes unzipped during dna replication is called the replication fork.

How can you predict if an element will form a cation or an anion?

Which of the following is a scientific question

Terry has recently been diagnosed with an inherited form of depression. which of the flowing is the most likely cause or the depression? a. Terry has a mutation in the enzyme involved in NE synthesis b.

What makes water a polar molecule? Choose 1 answer: It has fully positive and negative charges. It contains ionic bonds. C) It is able to dissolve nonpolar substances. It contains partial positive and negative charges.

What characteristics are common in all mammals?

What is the function of the nucleolus? *Subject was not below, but the subject is science.