1. The sum of adjacent angles of a quadrilateral is__.
(a) 360°
(b) 180°
(c) 90°

In the practice of science, this type of reasoning is used to develop explanations.

Select the correct answer from each drop-down menu. the lac operon in e.coli regulates genes that code for enzymes required for breakdown of lactose. the lac operon is operon that is activated in the presence of .

How do the sperm cells get from the stigma to the ovules? a. they slide down the petals to the bottom of the flower. b. they travel through pollen tubes. c. they travel along filaments. d. insects carry the sperm cells from the stigma to the ovules.