Scientists assume that an organism’s ancestors required a climate similar to the climate required by the present-day organism.
a. true
b. false

a. True

This is somehow true. If the climate before, thousands of years ago was in harsh conditions; the same conditions today many organisms would not survive. Hence, certain climate conditions is needed for an organism complex such as mammals, humans and the similar organisms to thrive. 

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.