Certain substances can't pass through the membrane but need to get in/out. What can cells use to allow specific substances in/out, "doors"
A. Protein tunnels
B. Protein ions
C. Protein channels
D. Protein stations

please don’t give me the link to get the answer .. it doesn’t work

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above

Astudent completed a lab report. which correctly describes the difference between the "question" and "hypothesis' sections of her report? "question states what she is asking, and "hypothesis" states the result of her experiment "question" states what she is asking, and "hypothesis" states what she thinks the answer to that question is in 'if. then because" format. "question" describes what she is trying to find out, and "hypothesis" states the procedures and methods of data collection. "question" describes what she is trying to find out, and "hypothesis" states any additional information or prior knowledge about the question

How are agricultural practices used today