Fishery workers have been known to try to kill the sea stars that eat their clam or oyster beds by cutting them in half and throwing them back into the ocean.
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As humans, we are used to thinking of animals as having two separate sexes, male and female, determined at conception.
However, in the animal kingdom, there are many variations on this theme.
Parthenogenesis is a form of asexual reproduction where an egg develops into a complete individual without being fertilized.
The resulting offspring can be either haploid or diploid, depending on the process and the species.
Asexual reproduction produces offspring that are genetically identical to the parent because the offspring are all clones of the original parent.
This type of reproduction occurs in prokaryotic microorganisms (bacteria) and in some eukaryotic single-celled and multi-celled organisms.
Two Komodo dragons, a bonnethead shark, and a blacktip shark have produced parthenogenic young when the females have been isolated from males.
Sexual reproduction is the combination of (usually haploid, or having a single set of unpaired chromosomes) reproductive cells from two individuals to form a third (usually diploid, or having a pair of each type of chromosome) unique offspring.
Fragmentation is the breaking of the body into two parts with subsequent regeneration.