The answer is A. This is the only grassland competition.
Answer:
DNA mutations cause cancer or an inability for proper function of the immune system.
Explanation:
DNA is our blueprint, so if something is wrong on the blueprint, then our body will "collapse" like a building (well not always). Let's say, the gene for immune system function is mutated and comes out wrong. That person might not be able to make white blood cells which fight off sickness. Other mutations can also cause cancer, which is a really bad form of sickness.
The immune system<span> is the body's defense against infectious organisms and other invaders. ... One of the </span>important<span> cells involved are white blood cells, also called leukocytes, which come in two basic types that combine to seek out and destroy disease-causing organisms or substances.</span>
2 lowercase letters means that the recessive gene is visible, so it should be red feathers