For a normal person, about how long does a cycle of sleep (from stage 1 to stage 4 and back again) last?

Plz fast biotechnology is a growing field of applied biology. many crops such as corn have been engineered to be resistant to herbicides. therefore farmers can spray these chemicals to kill weeds growing near the crop without worries of killing the crop itself how does this type of biotechnology work? a. by changing the genetic make up of the crops. b. by causing the crops to kill the weeds. c. by changing the type of crops used. d. by changing the location of the crops.

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

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups