Think of an experiment you did in a past science class. ( nd answer the questions of wht u did in the past class)
a- describe the experiment
b- what was the experimental variable?
c- what were two control variables?
d- what was the outcome of the experiment?

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.

Sound is a disturbance that travels through a medium as a