Answer:
During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining — a process called implantation.
Explanation:
Answer:
W = Animal
X = Bacteria
Y = Protist
Z = Plant
(may or may not be right btw)
False !! covallent bond is formed by sharing ; iconic bond is formed by donation or transferring electrons !!
it's either b or a I just studied this I believe its b though I know it's not d becuade hereditary mutations are passed dow. from parents not outside sources and it's not d because it's not true