Me : (when heating a test tube or flask,
a)it should remain capped.
b)an experimenter can briefly look directly into the tube to make observations.
c)it should remain in the test tube rack.
d)safety goggles should be worn for the duration of the experiment.

The transport tubes from food came down the plant are called?

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

How many chromosomes does each human cell contain? a. 23 chromosomes b. 26 chromosomes c. 43 chromosomes d. 46 chromosomes