Option a is the exact answer ...
<em>pls </em><em>mark</em><em> brainliest</em><em>.</em><em>.</em><em>.</em><em> </em><em>hope </em><em>it</em><em> helped</em><em> you</em><em>.</em><em>.</em><em>.</em><em> </em><em>:</em><em>)</em>
The reason people who have AIDS can't fight it off is because it is an immune disease it quickly weakens the immune system and makes a persons body too weak to fight anything off.
Lysosomes break down food and worn out cell parts
They contain symbiotic bacteria called rhizobia within nodules in their root systems, producing nitrogen compounds that help the plant to grow and compete with other plants. When the plant dies, the fixed nitrogen is released, making it available to other plants; this helps to fertilize the soil.