A bacterium closely associated with humans is known to be responsible for gastric ulcers and

stomach cancers. The genus of this bacterium is:

A. Heliothrix

B. Helicobacter

C. Herpetosiphon

D. Histophilus

E. Herbaspirillum

Over many generations darker for color becomes more common in a population of squirrels living in a shady area

Which best describes the relationship of the embryo and the fetus? O O O O The embryo and the fetus are both formed when the sperm and egg fuse. The fetus differentiates into the embryo and the placenta. The embryo has more cells than the fetus has.

A phenotype that results from a dominant allele must have at least ___ dominant allele (s) present in the parent (s).

Which of the following sentences shows a periodic pattern? A. there are two ducks in one pond B. there is meat next to the cheese in the refrigerator C. a boy waits five minutes to talk to his father D.

Which later is the suns visible surface layer

Sally and Harry fall in love. They introduce Sally's identical twin, Emily, to Harry's identical twin, Ken. Soon there is a double wedding where Sally marries Harry and Emily marries Ken. Both Sally and Emily get pregnant.

Which process moves water molecules across the membrane of a cell? diffusion endocytosis exocytosis osmosis

Which of these is NOT a main type of tissue? connective skeletal nervous muscle

Which of the following is true with respect to mutagens? Mutagens are chemical or physical factors that increase the rate of mutation. Mutagens are the genes that cause mutation. Mutagens are inheritable characters that develop mutation.

Who was the first person to observe a living cell in a drop of pond water.