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May 2021 Sexual reproduction is common among protozoa but rare among free-living , which usually reproduce asexually unless food is scarce or the environment changes drastically.

Cold Spring Harbor Laboratory Press.

bright colors would seem to make a bird more visible to predators.

Botanical Journal of the Linnean Society.

Species that have male and female members are called dioecious from the Greek for 'two houses'.

Sex differences See also: and is the fundamental difference between male and female.

Sexual systems Main article: A is a distribution of male and female functions across organisms in a species.

Chuck Grassley, R-Iowa, this week asking about the status of a Trump-era MS-13 task force, and expressed concern that the lower number of MS-13 apprehensions was not due to fewer MS-13 members trying to get in, but that more were sneaking past Border Patrol.

As the 1:1 sex ratio is approached, the advantage associated with producing males dies away.