Which of the following characteristics of living things best explains why birds fly south for the winter? Question 4 options: a. Living things respond to their environment. b. Living things maintain internal balance. c. Living things are made up of units called cells. d. Living things are based on a universal genetic code.

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

What is the process of a new plant growing from its seed into a seedling? primary growth fertilization pollination germination

Scientists are conducting a study on the effectiveness of a new drug on memory loss. they are giving some of the test subjects the new drug to find out if it improves their long-term memory. which are possible limitations of this study? check all that apply. a) test subjects may want to participate in additional experiments. b) test subjects may think they should be paid more. c) test subjects may get bored and want to quit early. d) test subjects may have to travel during the experiment. e) test subjects may have full-time jobs. this is multiple choice. you for the !