Identify three substances that are removed from the air as it is filtered.

Aperson travels 35 km in 0.4hrs, followed by 53 km in 0.6 hr. what is the average speed

What does it mean for a cell membrane to be selectively permable

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.