Answer:
Single celled or unicellular organisms use simple processes such as diffusion and active transport to gain nutrients. iii) Unicellular organism requires less energy and makes use of simple process such as diffusion to perform gas exchange.
Explanation:
The factor that is responsible for the phenomenon of the blood group B being almost absent in Native Americans whose ancestors arrived in very small numbers about 10,000 years ago would be called the 'founder effect'.
External nares are another term for nostrils. Naturally, pigs use their nares to breathe in air and expel filtered air from the lungs. The scientific terminology for air entering the lungs is known as inspiration, while air going out is termed expiration.
