The change in fossils at the K-T sediment layer suggests that in addition to the dinosaurs, _________ also went extinct.
Fill in the blank(s) with the appropriate word(s)
Answer: About three-quarters of all species living at the time
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Why do nocturnal animals usually have large pupils in their eyes? How is that related to the way astronomical telescopes work?
What will be an ideal response?
The Sun is a fairly normal star
Indicate whether the statement is true or false
An electric car is designed to run off a bank of 14.0-V batteries with total energy storage of 3.00 × 10^7 J. If the electric motor draws 7 000 W, what current will be delivered to the motor?
a. 500 A b. 250 A c. 750 A d. 375 A e. 125 A
The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air resistance, how long does it take the football to reach the top of its trajectory?
A) 1.0 s B) 2.0 s C) 3.0 s D) 4.0 s E) 5.0 s