Which is the transfer of genes from one population to another? gene flow genetic drift gene mutation genetic selection

What's the waste product of electrons and pyruvate combining in fermentation?  

"does stress during a woman's first trimester of a pregnancy affect the infant's birth weight? " is a

Chimeras are interesting organisms that have two different sets of dna. chimeras occur when when two different zygotes fuse to form one organism. some chimeras have no outward symptoms, while some have two different eye colors it two different blood types what roles do mitosis and meiosis play in the process