why do eggs have a better chance being fertilizied internally?

Answer 1

Internal Fertilization occurs when sperm are deposited in or near the female reproductive tract and fertilization occurs within the female body. Requires a more sophisticated reproductive system and cooperative mating behaviors. Copulatory organs for sperm delivery and repository must be present. mating behaviors must include specific reproductive signals for copulation to occur.
Internally produced embryos may be protected by a hard shell, as in reptiles and birds. Placental mammals retain their offspring in special structures called the uterus. Internally protected zygotes have a higher rate of survival with a minimum of eggs being produced.

Answer 2

Scientifically, biologists still do not fully understand every mechanism associated with fertilization. While the basic meeting of sperm and egg are now common knowledge, we still are far from understanding the role of all hormones, organ movements, time, temperature, pH, and the hundreds of other environmental variables. Because we don't understand them, we cannot control them in vitro (outside the body). Therefore, because in vivo (inside the body) fertilization controls all the variables we don't even know about, it has the best chance for success.

Answer 3

Internaly the basic body tempreture is about what the sperm are used to which will give them an increased amount of time in which to reach the egg and fertilize also the fact that there aren't hungry predetors inside the mother