Answer:
only 30% of total energy will be useful ..
So, Useful energy =
13.5J energy is useful
The best way for adolescent to build and protect his or her bones is to ingest food products that are rich in calcium for it is known to make bones stronger. Another way is to be able to do exercise as a daily routine so that the bones are exercised every day to prevent bone disease, this will stenghten the bones and make them more stronger.
It is a rare genetic mutation that both the maternal and paternal partners have to be at least a carrier for the albinism gene.
meaning: type of tissue in a plant
