2. Which of the following best explains why the cell membrane is described as selectively permeable? * A. 
Substances are not allowed into the cell.
* B. 
Substances diffuse freely in and out of the cell.
* C. 
Some substances pass into the cell while others cannot.
* D. 
Some substances can move into the cell but not out of the cell.

C

Explanation:

because the selectively permeable membrane allows some substances to pass while others not.

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).