Answer:
a.they work together to allow gas exchange
Explanation:
the trachea helps transport air to the lungs, the lungs fill with air, finally the alveoli convert the oxygen to the bloodstream
A clone is a copy or a genetically identical being.
For example, if I were to clone myself, I would have a genetically identical being that looked and acted the same as me. We would have similar thought patterns and such. Much like having a sibling, brother or sister, except an identical copy of yourself.
A reproductive barrier keeps similar species from interbreeding.
Food is not recycled much due to the fact it cant be recycled
Homozygous recessive/dominant refer to a gene which has to same alleles when it's visible in the offspring its dominant,when its not visible <span>in the offspring</span> its recessive.
