What basic unit of heredity is found on segments of DNA and are passed on from parent to offspring?
A) nucleotide
B) gene
C) phosphate molecule
D) deoxyribose sugar

Gene

Explanation:

The gene which is the basic unit of heredity is a sequence of nucleotides in either RNA (as found in some viruses) or DNA (mostly in eukaryotes) that encodes information/instructions for the synthesis of a gene product which could be a protein or could be an RNA. This basic unit of heredity is what is passed on from parent to offspring as it is present in the sperm cell and the egg cell which are involved in the formation of the offspring.

within 30 of the equator hope this

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.