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During which phase in life does a frog resemble a mammal most?A) blastula B) phylotypic stageC) holoblast D) gastrula
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- Fossil data indicate thata. life originated 4 BYA.b. life may have originated 3.5 BYA, but definitely did so by 3.2 BYA.c. the Cambrian explosion led to the origin of life.d. plants played an important role in causing glaciation.
- During cleavage, morula and blastula are formed. The main feature of blastula is it begins to form a cavity in the middle. The cavity is called a blastocoel. Summary: blastula is an embryo with a distinct blastocoel.