What does it mean for a backyard ecosystem to have a low diversity

Agood hypothesis includes which of the following? a: prediction b: data c: uncertainty d: conclusion

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions