Because it's implied, recessive phenotypes have to be homozygous otherwise the recessive allele does not express as phenotype.
If you’re trying to figure out if it’s true or false it’s true
Pseudoscience is literally just FAKE SCIENCE. remember that
Natural selection :) In simple terms in the one with the best traits will repopulate so they can have the best traits the individuals who are weak typically die off and no one breeds with them :)
Respiration releases the energy