Air passes through is: Nostrils → nasal cavity →Pharynx → Larynx →Trachea → Bronchi (with cartilaginous rings) →Bronchioles (without rings) → Alveoli (air sacs). Alveoli are the seat of exchange of O2 / CO2 between lungs and blood.
If about 30% is A then 30% is T. That leaves 40% to be G + C...so each must be around 20%.
Answer:
Carrier proteins move materials from one side of the cell membrane to the other. This is useful for both active transport, meaning you have to transport against the concentration gradient, and facilitated diffusion, a form of passive transport.
Answer:
A
Explanation:
Both mitochondria and chloroplast lack a nucleus, but instead, they are found in the cell (which is mostly eukaryotic). They are also thought to have their evolutionary origins as simple single-celled organisms.
