Can anyone answer this question?

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

The leopard frog and the pickerel frog are two closely related species. in areas where their ranges overlap, the frogs will remain separate species if they

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?