PLEASE HELP ME WITH THIs

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Based on the law of dominance, we would expect percent of the offspring from this cross to have large teeth.