Anormal sperm whose
chromosomes don't contain the sex chromosome that is responsible for life
can fertile a normal ovum and
a. down's case occurs.
c. fetus death occurs

b. klinefelter's case occurs.
d. normal male produces.

d.

hope to be marked brainliest

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.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this