If an organelle is selectively permeable what can we
infer about its function?
A. The organelle allows molecules to
pass through easily.
B. The organelle doesn't allow any
molecules to pass through.
C. The organelle. allows some
molecules to pass through.
D. The organelle allows large
molecules to pass through easily.

True or false: (a) the strings of little red dots represent carbohydrates. (b) the model is called a bilayer because there are two main types of molecules present, lipids and proteins. (c) the many black lines represent amino acid tails. (d) this model shows membrane transport. (e) the blue ovals are hydrophobic. (f) the blue ovals represent phospholipid heads.

How energy move through ecosystem ?

What happens to the amount of waste in the pond as the ecosystem ages?