Answer:
1. Pluto is one third water
2. Pluto was discovered on February 18 , 1930 by the Lowell Observatory
3. Pluto has five known moons
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Bilaterians, for example, are all triploblastic.
<h3>Comparative embryology</h3>
Comparative embryology is a major branch of embryology that deals with comparison of the embryo of different species, thereby showing there relationships.
Triploblastic animals are those animals that have three embryonic germinal layers which include ectoderm, endoderm and mesoderm.
Learn more about comparative embryology here:
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Answer is c it is surrounded by cell membrane