What is true for urochordates?

A. The notochord is present throughout their lives.

B. The notochord is present only in the larval stage; it is absent in adults.

C. The notochord is present in the larval stage; it becomes vertebrae in adults.

When early systematists distinguished Chondrichthyes (cartilaginous fish) from Osteichthyes (bony fish), it was not clear exactly when bony skeletons first appeared in the vertebrates.

The reaction below shows a system in equilibrium. How would an increase in the concentration of chemical A affect this reaction? A. The equilibrium of the reaction would remain constant. B. The equilibrium of the reaction would shift to the right. C.

what molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

The sum of 8 and 5 is equal to the difference of a number and 7

In the molecular models to the right, the blue atoms are hydrogen, the red atoms are oxygen, and the gray atoms are carbon. Identify the organic molecule by circling it. What distinguishes molecule from the other? Explain your reasoning.

How does a law differ from a theory? A. A law is a theory that has been proven to be true and universal. B. A theory is a group of hypotheses that prove a law is true. C. A law is a statement of fact, but a theory is an explanation. D.

Can someone give me a high school level science fair projects with something to do with bones?

The storage of heat in the lower layer of the atmosphere due to certain gases absoring heat is called

A red blood cell is 8 μm in diameter. If drawn 100 times larger than its actual size, what diameter will the drawing be in mm? A. 0.08 mm B. 0.8 mm C. 8 mm D. 80 mm

Which kind of biologist would most likely use satellite technology?