Given below is the representative evolutionary history of vertebrates through geological periods. A, B, C, and D, respectively, are:
  

1.	Dinosaurs, Thecodonts, Therapsids, and Pelycousurs
2.	Dinosaurs, Therapsids, Thecodonts, and Pelycosaurs
3.	Pelycosaurs, Therapsids, Thecodonts, and Dinosaurs
4.	Theraosids, Dinosaurs, Pelycosaurs, and Thecodonts

The following two plants exhibit:

1. Analogous organs
2. Vestigial organs
3. Rudimentary organs
4. Homologous organs

In the apparatus of the Urey and Miller experiment, the gases [G] contained in the flask are:
 

Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I                               Column II
I. Sickle cell anemia             1. Sympatric speciation
II. Polyploidy                       2. Balancing selection
III. Darwin finches               3. Adaptive radiation
IV. Tail in humans                4. Atavism
Codes:
        I    II   III    IV
A.     1    2    3     4
B.     2    1    4     3
C.     2    1    3     4
D.     1    2    4     3

Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I                                      Column II
(geological period)                       (major event)
I. Ordovician                               1. First vertebrates
II. Carboniferous                         2. Origin of reptiles
III. Jurassic                                 3. Angiosperms appear
IV. Cretaceous                             4. Dinosaurs dominant

Codes:

       I   II   III   IV
A.    1   2    3   4
B.    2   1    4   3
C.    2   1    3   4
D.    1   2    4   3

Match each item in Column I with one item in Column II and chose your answer from the codes given below:
Column I                                              Column II

I. Homologous organs                    1. Eye of an octopus and eye of a mammmal

II. Analogous organs                      2. Thorn of Bougainvillea and tendril of Cucurbita

III. Vestigeal organs                       3. Body hair and wisdom teeth in humans

Codes:
       I    II    III
A.    1     2    3
B.    3     1    2
C.    2     1    3
D.    1     3    2

At the time early life first formed on Earth, the atmosphere could best be described as:

1. oxidizing

2. reducing

3. rich in oxygen

4. low in hydrogen gas

Distantly related organisms with similar traits have experienced:

1. Coevolution
2. Convergent evolution
3. Divergent evolution
4. Parallel evolution

Disruptive selection favors:

1. Both extreme forms of a trait
2. Intermediate forms of a trait
3. One of the extremes of a trait
4. Environmental differences

Which one of the following would cause the Hardy-Weinberg principle to be inaccurate?