Varicose veins seen in the superficial veins of the legs are unsightly and are often treated by surgical removal. however, even without these veins being present, the return of all blood toward the heart from the legs is not diminished. this is primarily because varicose veins seen in the superficial veins of the legs are unsightly and are often treated by surgical removal. however, even without these veins being present, the return of all blood toward the heart from the legs is not diminished. this is primarily because the precapillary sphincters will contract to prevent blood from flowing toward areas where veins have been removed blood can still return via the deep veins in the absence of the venous valves (that have been removed), the blood will backflow into the capillary beds and then flow into other venules all of the listed responses are correct.

Two male mice, which we will call male a and male b, are both phenotypically normal. male a was from a litter that contained half phenotypically normal mice and half dwarf mice. the mother of male a was known to be homozygous for the normal igf2 allele. male b was from a litter of eight mice that were all phenotypically normal. the parents of male b were a phenotypically normal male and a dwarf female. male a and male b were put into a cage with two female mice that we will call female a and female b. female a is a dwarf and female b is phenotypically normal. the parents of these two females were unknown, although it was known that they were from the same litter. the mice were allowed to mate with each other, and the following data were obtained: female a gave birth to three dwarf babies and four normal babies. female b gave birth to four normal babies and two dwarf babies. which male(s)mated with female a and female b? male a with both females male a with female b, and male b with female a male a with female a, and male b with female b could not be determined male b with both females

Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.

What is the number of cells produced in mitosis