A scientist maintains a healthy culture of a single species of bacteria in a container. She then introduces a new substance into the bacterial culture. Within a day, most of the bacteria died. image 86cf74f53c2e4425bff92c715f982334
Which of the following best explains why some of the bacteria survived?
A
They mutated and became a different species after exposure to the substance.
B
They had a genetic variation that gave them resistance to the added substance.
C
They absorbed the substance and broke it down in their digestive systems.
D
They were exposed to the substance long enough to develop a resistance to it.

Are the earth's ocean floor and continents the same age geologically? why or why not?

Nhumans, abo blood types refer to glycoproteins in the membranes of red blood cells. there are three alleles for this autosomal gene: ia, ib, and i. the ia allele codes for the a glycoprotein, the ib allele codes for the b glycoprotein, and the i allele doesn't code for any membrane glycoprotein. ia and ib are codominant, and i is recessive to both ia and ib. people with type a blood have the genotypes iaia or iai, people with type b blood are ibib or ibi, people with type ab blood are iaib, and people with type o blood are ii. if a woman with type ab blood marries a man with type o blood, which of the following blood types could their children possibly have? in humans, abo blood types refer to glycoproteins in the membranes of red blood cells. there are three alleles for this autosomal gene: ia, ib, and i. the ia allele codes for the a glycoprotein, the ib allele codes for the b glycoprotein, and the i allele doesn't code for any membrane glycoprotein. ia and ib are codominant, and i is recessive to both ia and ib. people with type a blood have the genotypes iaia or iai, people with type b blood are ibib or ibi, people with type ab blood are iaib, and people with type o blood are ii. if a woman with type ab blood marries a man with type o blood, which of the following blood types could their children possibly have? a, b, ab, and o ab and o a, b, and o a and b

Hemoglobin is a proton that carries oxygen around your body what is hemoglobin made from