Guanine - Cytosine
Thymine - Adenine
Unfortunately this question is incomplete as it is a multiple choice question. The following options are provided:
<span>A) body cavity between body wall and digestive system
B) number of embryonic tissue layers
C) type of body symmetry
D) presence of Hox genes
E) degree of cephalization
The answer is D: presence of Hox genes
</span>
Hox genes are a group of genes that determine the basic structure and orientation of animals.
1 is A. a mold.
2 is B. <span>all of the changes during Earth's history have been slow and gradual.</span>
It is b or the second answer choice shown
