Answer:
The plasma membrane is selectively permeable
Explanation:
hydrophobic molecules and small polar molecules can diffuse through the lipid layer, but ions and large polar molecules cannot. Integral membrane proteins enable ions and large polar molecules to pass through the membrane by passive or active transport.
There are no true tropic climates
The answer is B and D i learned this in biology last week
1,000 years
In many parts of the world, trees can provide a climate history for hundreds of years, with some extending back 1,000 years or more.
Experimentation to determine the temperature of stars
