A. Only mammals
A.
B. Only oviparous animals
B.
C. Only viviparous animals
C.
D. All sexually reproducing animals
D.
Correct Answer: D
সঠিক উত্তর: D
Explanation
ব্যাখ্যা
A zygote is the fertilized egg cell that forms when a sperm from the male and an egg from the female fuse together. This process of fertilization occurs in all animals that reproduce sexually.