Hello people ~ Which of the following factors are essential to ignite a fire?

A. All of these

B. Fuel

C. Air (oxygen)

D. Heat

The body is protected against harmful flu viruses by

What does it mean for a cell membrane to be selectively permable

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.