What is structure 3, and how does it help sustain life?
A.
Structure 3 is the nucleus, which is the control center of the cell.
B.
Structure 3 is a chloroplast, which is the site of photosynthesis.
C. Structure 3 is the cell wall, which gives the cell structural support.
D. Structure 3 is a mitochondrion, which is the site of cellular respiration.

legislative branch:

one of the three branches of government divided between the senate and the house of representatives.

- creates or makes laws

- power to override a veto

executive branch:

one of the three branches of government, headed by the president.

- enforces or carries out laws

- power to veto a bill sent to it by congress

judicial branch:

one of the three branches of government, headed by the chief justice of the supreme court.

- interprets laws

- power to declare laws or actions by the government unconstitutional

a causal relation between two events exists if the occurrence of the first causes the other. the first event is called the cause and the second event is called the effect. a correlation between two variables does not imply causation.

explanation: