A species of lizard has the ability to reproduce sexually or asexually.

Q: A species of lizard has the ability to reproduce sexually or asexually. A group of these lizards is living in an environment that is getting wetter and wetter each generation due to global climate change. 

A. Should these lizards reproduce sexually or asexually? (circle one) the answer is sexually

B. Explain your answer for part A.

I am trying to correct my biology midterm. I need help with part B of the above question.