Suggest two reasons why the uk government wants to encourage recycling of iron and

One of the cell membrane's functions is to protect the cell keep wastes in the cell create new cells keep light out of the cell

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

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