Beacause different animals produce and lay or have differnet things and different amounts. That's how science works.
Both.
Only two mammals produce eggs, the echidna and the platypus.
The queen is the only fertile female in a colony of honey bees and can lay over 1000 eggs per day.
No you only produce eggs during your menstrual cycle
Females only produce one or two eggs, males produce many sperm.
They have a bicornuate uterus, and two ovaries and oviducts. Only one of the ovaries is functional, however, when the working ovary ceases to produce eggs, or is harmed, the other non functional ovary will become functional and will produce eggs.
Male snakes do not produce eggs. Female snakes are the only snakes to produce eggs.
Amphibians do not produce babies but lay eggs out of which some are lost only a few survive.Sea turtle can produce about the eggs,but ,mosquito can produce hundreds eggs .
Only fertilized eggs produce chicks and even then, only under certain conditions. The eggs you buy in the grocery store are not fertilized and can never be incubated. Most eggs sold in stores are not viable.
Not all animals have placentas because they lay eggs instead. Only mammals have placentas by the way. Other animals use eggs and amniotic eggs.
Female grasshoppers can. But male grasshoppers can only produce the eggs.
Yes