The Cambrian explosion was a period at the Pre-Cambrian boundary of the geologic time scale at 542 Ma. At this boundary, the fossil record shows that animals suddenly appeared in a dramatic radiation of life. A radiation is the relatively rapid development of new types of organisms that derive from a common ancestor. The Cambrian explosion is important because it marks the origination of all major animal groups called phyla.
Answer:
C. Organelles are manufactured.
1. allele
2. recessive
3. gene
4. genotype
5. phenotype?
6. dominant
Answer: karyotype
Explanation: if you suspect trisomy, you need to count chromosomes!
