Zirconium has an atomic number of 40 and an atomic mass of 91. how many neutrons does it have?

Which two factors contributed to creating a global culture? the creation of the united nations improvement in telecommunications health issues such as the ebola virus increased opportunities for global travel

Hurry where is the majority of earth's water found? o glaciers o oceans ground o rivers and lakes

During a fierce storm a large number of tall trees on an island are uprooted by the wind and die. most of the trees on the island are now short trees and produce seeds that grow into short trees. what concept is shown in this example? question 5 options: natural selection artificial selection genetic engineering gene splicing