What is the class of vertebrates who have a skeleton made of cartilage?
a. Osteichthyes
b. Chondrichthyes
c. Reptilia
d. OphiuroidsOphiuroids
e. Myxiniformes
b
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For much of the past decade, battles were going on over oil and gas drilling in the Arctic National Wildlife Refuge.
Answer the following statement true (T) or false (F)
Temperatures within these features can reach 100 million degrees Kelvin:
A) granules. B) flares. C) sunspots. D) the solar wind.
Relative age-dating methods
A. allow Earth scientists to determine exactly when rock layers were deposited. B. allow Earth Scientists to determine that rock deposited during the Cambrian period is 530 million years old. C. allow Earth Scientists to determine exactly how old the Earth actually is. D. allow Earth Scientists to determine if a specific rock layer is older or younger than rocks above or below it. E. allow Earth scientists to know that the Cretaceous-Tertiary Boundary occurred exactly 66 million years ago.
Highway tunnels are very expensive, but are often times more cost effective over the long-term compared to the cost of repeated repairs and maintenance in areas where mass wasting is difficult to control.
Answer the following statement true (T) or false (F)