Which of the following statements about tolerance range is true?

Embryos of different species look very similar, which shows that the organisms share a ancestor.

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

Which formula can be used to calculate the molar mass of hydrogen peroxide