I'm doing a lab report and am unsure which variables are independent, dependent, and controlled. my lab is due tomorrow i did a lab where i took four cups and filled them each with 1/2 cup of water. i left one cup of water untouched. with the rest, i added 1 tsp of salt into one, 2 tsp of salt into another, and 3 tsp of salt in the last one. i then put them in the freezer and checked every 15 minutes for four hours to see if salt affects how water freezes.

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution

In what ways does the study of human population differ from the study of wildlife ecology

Imagine a person stepping on a pin and pulling his or her foot away. look at the reflex arc of this scenario below. which statement best describes the image? a)the sensory nerve carries the signal from the effector to the interneuron, and the motor neuron carries the signal to the receptor. b)the motor nerve carries the signal from the receptor to the interneuron, and the sensory neuron carries the signal to the effector. c)the sensory nerve carries the signal from the receptor to the interneuron, and the motor neuron carries the signal to the effector. d)the sensory nerve carries the signal from the receptor to the motor neuron, and the interneuron carries the signal to the effector.