If a sample contains 100g of a radioactive isotope, how much will be left after 3
half-lives?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Akrabby blind whale has married pearl who has normal vision. oneof their two sons is also colorblind. what arr the genotypes of the parents?

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.