How would the exchange of molecules between an organism and its environment be affected if the membrane were less permeable? (3 points)
a) Fewer membrane proteins would be needed to carry out active transport of nutrients.
b) Molecules needed for growth would have more difficulty diffusing across the membrane.
c)Organisms would be more susceptible to harmful substances crossing the membrane.
d) The membrane would rearrange to form a single phospholipid layer to transport materials.

20 point pls brianliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?