Answer:
27 volts
Explanation:
According to Ohm's Law
V=IR
where V is voltage I is current and R is resistance
V=3*9
V=27 volts
A and b are cells so they definitely are not bacterium so c and d are bacterium I think. Your welcom.
It can contaminate the air causing people that breath it in to become sick.
Crossing-over occurs when two homologous chromosomes exchange genetic material during meiosis I. The closer together two genes are on a chromosome, the less likely their alleles will be separated by crossing-over.