Roma extendio su imperio aserca de 40 paises-ylas

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

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

What must be done to breed dogs for a partical trait