How many sex chromosomes are there in a normal human karyotype?
a. 4
b. you only need one sex chromosome, and that determines if you are a male or female.
c. 2

i'm confused..

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

What is the importance of having the us forest service, the bureau of land management, the us fish and wildlife service, and the national park service? to manage land resources for conservation and the development of natural resources to manage land resources for conservation and the development of urban areas to preserve historical landmarks and manage the development of urban areas to preserve historical landmarks and manage the development of rural areas

What was the purpose of mendel's experiments with dihybrid crosses? a. to determine if dna was a transforming factor b. to determine if traits could be recessive c. to determine if traits affected each other d. to determine if traits had more than one allele