Harmful because they change how the genes are supposed to form and they can give disorders at times.
Answer:
Predation.
Explanation:
Limiting factor refer to resources or environmental condition that limit the growth or distribution of organisms in the ecosystem. This make the organism not to occupy their original niche. Predation is a limiting factor. Predation refer to ability of an organism to prey on another organism or capture it. Predation is a density dependent factor whose effect on population determined the total size of the population. Fox chasing pika is an example of predation.
Direct observation is an observation you make first hand. It is something you see with your own eyes and observe yourself.
Hope this helps!
Answer:
I believe the answer is B. X-spongy;Y-marrow