An amine and carboxylic acid
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.
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The correct answer is A i'd say. This is due to a process called diffusion.
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As a control for the sasquatch experiment, a fake deer is placed in the forest. The role of this control in experiment is to provide a basis of comparison to the experimental group.
Scientists often analyze hypotheses developed by them by means of controlled experiments. A controlled experiment is a scientific test performed under controlled conditions, denoting that only one or a few variables are altered at a time whereas, all the remaining variables are kept constant.
Controls are utilized in an experiment to reduce the effects of variables besides the one being tested. An experimental group is also sometimes referred to as a treatment group, which receives a treatment in an experiment.
To learn more about controlled experiments here
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A volcanic bomb is a mass of molten rock bigger than 64 mm (2.5 inches) in diameter, formed when a volcano ejects viscous fragments of lava during an eruption. They also cool down into solid fragments before they land on the ground<span>.</span>
