The Carboniferous period is well noted for the
A) emergence of the insect.
B) evolution of the amniotic egg.
C) age of the reptiles.
D) extinction of shallow water organisms.
Answer: B
You might also like to view...
A beam with an overhang is loaded by a uniform load of 3 kN/m over its entire length. Moment of iner- tia Iz 5 3.36 3 106 mm4 and distances to top and bottom of the beam cross section are 20 mm and 66.4 mm, respectively. It is known that reactions at A and B are 4.5 kN and 13.5 kN, respectively. The maximum bending stress in the beam is approximately:
(A) 36 MPa
(B) 67 MPa
(C) 102 MPa
(D) 119 MPa
Emission nebula take up about how much of the Milky Way galaxy?
A) 1% B) 5% C) 10% D) 99% E) 100%
Which of the following is true of the central bulge in the Milky Way?
A) It is a slightly flattened spheroid. B) It is a part of the disk component of the galaxy. C) It consists of spiral arms. D) It is a highly active region for star formation.
A muon at rest decays in 2.2 ?s. Moving at 99.% the speed of light, it would be seen to "live" for how long?
What will be an ideal response?