In animals with yolk heavy eggs (including amphibians, reptiles, birds and monotremes), many sperm may enter the egg but only one fuses with the nucleus.
(many sperm; may enter; the egg; L:In animals with yolk heavy eggs (including amphibians, reptiles, birds and monotremes)
many sperm
may enter
the egg L:In animals with yolk heavy eggs (including amphibians, reptiles, birds and monotremes