Americium, the atomic number is 93
Tge cell membrane it does the function of the car's body
The cell membrane has selective permeability and chooses which to pass through. Non polar molecules can pass easily with diffusion, but ions cannot.
The answer is 50%.
This is an example of Mendelian monohybrid cross:
Parents: rr x Rr
Offspring: Rr Rr rr rr
So, in this cross, 2 out of 4 offspring will be heterozygous (Rr), and other 2 out of 4 (which is 50%) offspring will be recessive homozygous (rr) and will have freckles.
