The ultimate source of energy for every cycle is

The correct answer would be the sun.

Explanation:

The sun is the ultimate source of energy for earth's biosphere. It powers all the cycles and food chains present on earth.

The solar energy is converted into chemical energy by the process termed as photosynthesis. This energy then transferred to higher trophic levels in any food chain.

Thus, it helps in cycling of different elements such as carbon throughout the biosphere.

Another example may include water cycle which starts with evaporation and transpiration of water from water bodies. The energy for the same is also provided by the sun.

See the answer below

Explanation:

First, let us assume that the allele for free ear lobes to be represented by A. Thus, the recessive attached earlobe would be a.

The genotype for the heterozygous parents would each be Aa.

          Aa    x    Aa

      AA   Aa   Aa   aa (see the attached image for the Punnet's square)

Offspring:

1/4 AA - free ear lobes

1/2 Aa - free ear lobes

1/4 aa - attached ear lobes

Hence

Probability of the child having free ear lobes = 3/4 or 75%

Probability of the child having attached ear lobes = 1/4 or 25%