If you have both parents with long ears and some of the offsprings have short ears, you can say both parents are heterozygous for this. Both have a dominant (long ear), and a recessive allele (short ear).
To prove this, you can draw a Punnett square, and you'll see the probabilities of the offsprings.
The answer to ur question is A
Answer: A semi-permeable membrane is that which only allows certain
substances to pass through.
Latitude is not a factor in marine life divisions.