You are looking at a slide using your microscope and see many things moving about. you notice a very rigid structure outlining the cell. you like to have as many facts as possible to back up any claims you make, specially in science. what else would you to be sure what type of cell you are seeing? question 4 options: lysosomes chloroplasts mitochondria cell membrane

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?

Which of the following is a solution a- brewed coffee b-tomato juice c- ranch salad dressing d- muddy water