Question

9.
a. They defend the body against infection and disease:

i.Red blood cells

ii.White blood cells

iii. Plasma

iv. Urine​

Answer 1

Answer:

(ii) white blood cells (WBC)

Explanation:

The body also defends against infection by increasing the number of certain types of white blood cells (neutrophils and monocytes), which engulf and destroy invading microorganisms. The increase can occur within several hours, largely because white blood cells are released from the bone marrow, where they are made.

Answer 2

Answer:

White blood cells.

Explanation:

• White blood cells (WBC's) are part of body's immune system. They help the body fight infections and diseases. They are made in the bone marrow and are found in blood and lymph tissues.

Thank u...

Hope my simple answer help u..

Pls mark me brainliest...