A heterozygous right handed mom and a homozygous left handed dad (recessive) mate. What percent of children are expected to be left handed?

50% chance will left handed.  

Explanation:

Right handed = dominant (R)

Left handed = recessive (r)

Heterozygous right handed mom = Rr

Homozygous left handed dad = rr

According to punnett's square:

Rr    x     rr

=2/4 Heterozygous (Rr)

= 2/4 homozygous recessive (rr)

So, there will be 50 % or 2/4 chance of left handed children.

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the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]

light dependent reactions:

light independent reactions:

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