Answer:
Phloem sap.
Explanation:
A colloid is a combination of different types of molecules mixed through other substances that will not join (form a chemical bond) with the other substance.
Phloem sap is a mixture of water, carbohydrates, hormones and other type of substances flowing together but not bond by a chemical bond.
Preserves animal tracks are called trace.
Insects has repeated modular segment that develop independently of each other promoted their diversification and evolutionary success. They are able to evolve appendage that are specialized for diverse functions.
Hypotheses propose that insect diversity either result form low extinction rates and resilience to mass extinctions and acquisition of key innovation that allowed them to radiate into newly formed niches.
There exoskeleton characteristics are commonly responsible for the diversification of insects on land. These insects are the amazing diversity in the surrounding , it believed that insects are so successful because they have protective shell /exoskeleton , they have small in size and they can fly.
To learn more about the insect diversity here
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I believe vestigial structures are evidence of evolution because organisms inherit anatomy from their ancestors.
Hope that helps.
The connective tissue is among the four major classes of the tissue. It is the most widely distributed and the most abundant class of the tissues. However, the type of tissue in every organ varies. Composed of cells, fibers and matrix, this type of tissue is different in different organs of the body.
The variability in it's type is provided by the difference in the degree of the order of the cells, fibers, and the matrix. This variability contributes to the diversity of this tissue.
Hence, the blank can be filled with 'diversity'.