Skeletons of early vertebrates were composed of cartilage instead of bone. Which characteristic does cartilage share with notochords?

A. It is hard and rigid.

B. It is soft and flexible.

C. It contracts.

D. Oxygen can diffuse through it.

A person is contact paneling down river at average speed of 10 km an hour after 3.52 hours how far has she traveled

What is the difference between the leading and lagging strands

Which of the following would be found in DNA sequences but not in mRNA sequences? a) transcription start sites b) translation start sites c) open reading frames d) exons e) All of the answer options would be found in DNA sequences but not in mRNA

How does inappropriate land use, such as removing vegetation from hillsides and plowing fields parallel to a hillside, affect the erosion rates of that landscape? Explain your answer.

Which characteristics describe deep ocean currents? Check all that apply. move slowly caused by wind move cold water move in a circular pattem caused by differences in density

What should you do if your experiment does not turn out as you expected?

How can humans alter part of the water cycle? What effect will this have on the process as a whole?

All three regions of the brain stem can be observed on the ventral surface of the brain. all three regions of the brain stem can be observed on the ventral surface of the brain. a. True b. False

Which mineral is important for carrying o2 in the blood?

Deanna explains to Wesley the different types of nitrogen in the nitrogen cycle. Choose the sentences that she includes in her explanation. Select all that apply. A. Bacteria fix nitrogen from ammonia gas. B.