Usually 3 or 4 at a time. Could be more, but it's too much trouble.
one cell is produced from one primary oocyte.
One
A cow can deliver one calf at a time.
After meiosis in plants, only one out of the four megaspores produced survives and develops into a female gametophyte. The other three megaspores disintegrate.
Cows can have one or two calves at a time. Odd time she'll give birth to triplets.
depends but it is usually about three or four
millions of sperm
700
Possums generally give birth to just a single joey (baby possum) at a time.
Semen is produced continuously, more or less like your spit.
batch
The average red kangaroo only births one offspring at a time.
one
4
One
Mares are made to give birth to only one foal at a time. Rarely a mare will deliver twin foals that are able to survive, but this is truly a rarity.
Every time animals breath out is more carbon dioxide produced including you and me and that's only one source, there are many others.