A. Migration (birds migraye to warmer climates during colder months)
Well theory isnt proven. It means you have a strong idea about the subject your talking about. So if a scientist finds evidence that suggests something against the theory then it can be changed.
Answer:
The answer is a Carbohydrate!
Well a<span> sperm fertilizes an egg to form a zygote.</span>
Individuals inherit one 'factor' from each parent for each trait. A trait may not show up in an individual but can still be passed onto the next generation.
