The time in the history of Earth when evolution was progressing at the most rapid rate, as evidenced
by fossils such as those of the Burgess Shale, is the:a.
Cambrian period.
b. Ordovician period.
c. Silurian period.
d. Devonian period.
e. Carboniferous period
A
You might also like to view...
Describe the enzymatic digestion that takes place in each structure of the digestive tract
What will be an ideal response?
Trochophore and veliger larval stages occur in:
1.barnacles 2.sea urchins 3.sea squirts 4.bivalves
What happened in an experiment where normal cultured human cells were infected with a virus that carried DNA
encoding for the telomerase catalytic subunit? a. The cells underwent more cell divisions than normal. b. The cells underwent fewer cell divisions than normal. c. The cells died almost immediately. d. The cells did not express the foreign telomerase gene. e. The cell cycle shortened.
The skin cells of an adult female rat has 40 autosomes and 2 sex chromosomes. A healthy egg cell would contain which number and type of chromosomes?
A. 20 autosomes and 1 X chromosome B. 20 autosomes and 1 Y chromosome C. 40 autosomes and 2 X chromosomes D. 40 autosomes and 2 Y chromosomes