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So close to zero as being unmeasurable. The variations in markings come from random variations in wear of the rifling cutter, odd chips of steel produced by the rifling process, etc. Even two guns made in succession on the same production line will show differences in produced striations.
The two types of rock that are needed to produce an aquifer are sandstone, and are full of pores and can hold a lot of water.
a cumulus cloud and a cumulonimbus produce rain.
Kinetic (motion) and heat.
supercomputer and mainframe
no two giraffes have the same markings
Chickens produce eggs and meat.
The two popular types of pottery the Athenians produced were Black Pottery and Red Figure Pottery.
The two popular types of pottery the Athenians produced were Black Pottery and Red Figure Pottery.
Endowplasmic reticulum
Heterosporous plants are those that produce two types of spores that differ in size and sex. In particular, they produce two morphologically distinct types of sporangia (megasporangia and microsporangia) that create two distinct types of spores (megaspores and microspores). The spores then develop into separate male and female gametophytes. They are different from homosporous plants in which the sporophyte produce a single type of sporangium and then a single type of mother spore cell.
The two types of fermentation are alcoholic fermentation and lactic acid fermentation. Alcoholic fermentation is also referred to as ethanol fermentation.