A cast fossil is formed when

an imprint is left in mud

an organism is petrified

an organism is buried and part of the organic material is left behind

minerals fill in an impression left by an organism

The most complicated part of the brain is the a. thalamus. b. cerebellum. c. cerebrum. d. brain stem.

A microorganism has the following characteristics: Its cells have a nucleus and cell walls, it is multicellular, and it grows in long filaments. What is its general classification?

What will most likely happen if the level of greenhouse gasses continues to rise? Global temperatures will gradually decrease. Global temperatures will continue to increase. Global temperatures will fall rapidly.

Why do infants experience a physiologic hypogammaglobulinemia between 2 and 6 months of age?

Can H4C2O2 form hydrogen bonds

Which traight was important in the advancement of modern fish

Round (R) seed shape is dominant to wrinkled (r) seed shape in pea plants. If an RR plant is crossed with an rr plant, what is the frequency of phenotypes in the F2 generation? a. All wrinkled seeds b. All round seeds c. 1/4 RR, 1/2 Rr, 1/4 rr d.

Would a scientist who studies evolution also have to learn about other branches of if biology?

How many tigers are left in the world?

Which continents contain coal fields that provide evidence for continental drift?