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Yes they can, 52 in one egg sack.
Egg layer, most definitely. I've seen the egg sacs, being guarded by a fierce momma black widow.
On a web
Brown Widows make spiky eggs sacs.
Yes, their egg sacs contain hundreds of eggs. Before they lay their eggs they will eat the male (go figure). Then, after they lay their eggs they will die.
An average well fed female lays approximately 53 eggs per egg sacs and is capable of laying up to three egg sacs in a year. Many females lay fewer eggs, and large mature females may lay as many as 80 eggs per sac.
Praying mantids are insects and lay egg sacs. There is no live birth involved.
Some sharks let their eggs hatch inside themselves so at birth they would be called a pup. Some sharks lay egg sacs. At birth those would be called egg sacs. Once they hatch they would also be pups.
To get your pokemon to lay an egg you have to put 2 pokemon in the daycare.It has a better chance of laying an egg if you put Ditto in the daycare with the pokemon.
About 100-400 eggs
Yes, as an example, the American Robin (Turdus migratorius) female is black with speckles but the egg is "robin's egg blue".
Some sharks let their eggs hatch inside themselves so at birth they would be called a pup. Some sharks lay egg sacs. At birth those would be called egg sacs. Once they hatch they would also be pups.