Why is it necessary for the trachea to have rings of cartilage in its walls?

Which sentences describe the advantages of cogeneration? A. It reduces the emission of harmful greenhouse gases in the environment. It provides affordable heat and electricity to users.

A scientist is studying two isotopes of sodium, labeled A and B. In Isotope A, each of the atoms has 11 protons, 12 neutrons, and 11 electrons. What could be the atomic structure of Isotope B?

twin boys have girlfriends one of the couples have a baby would the dna of the lil baby be the same as the couples dna bc the boys are identical twins

Why is biodiversity important in a marine ecosystem

Nutrients are exchanged between the blood and body cells in the is it a. capillaries. b. veins. c. aorta. d. arteries.

What is the process of mountain building called

Sexual reproduction is the reproductive process that 1) keeps species from changing. 2) produces identical offspring. 3) causes mutations. 4) creates genetic variety.

About half of the forests that covered the earth in the early 1900s have been cut down. Discuss the impact this has on carbon dioxide levels in the atmosphere. Support your answer.

How manny amino acids are found in living organisms

A deletion of one base in the original segment of DNA is called a frameshift nutation what will happen to the newly synthesized protein as a result