<span> After fertilization, the </span>zygote<span> undergoes cleavage to form the blastula. The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form.</span>
the step in step 2 is wrong
Explanation:
The cause of DNA mutations is exposure to radiation from the sun and the effects of the DNA mutations are harmful mutations cause genetic disorder or cancer, changes gene's instruction for
making protein causing malfunction.
A abiotic factor because it is a nonliving thing in our ecosystem.