Which of the following statements about biodiversity is not true?
a.

changes to biodiversity never occur naturally.
b.

changes to biodiversity can lead to a decrease in ecosystem stability.
c.

changes to biodiversity can positively and negatively affect on an ecosystem.
d.

changes to biodiversity can lead to an increase in ecosystem stability.

In this case, the statement that people who exercise for an hour may have lower cholesterol levels is .

Where substance is produced during cellular respiration

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.