If you have 2 plants, take wheat for example.
If there's one species who can produce lots of grain but takes a long time to grow, and there's a different species who produces very little grain but grows quickly, many farmers will try and get both of the good traits.
If they want fast-growing wheat with lots of grain, then they'll breed them together and hope that they get a species with both of the useful traits.
The same goes for animals. E.g, cows that are very big but don't produce much meat and a cow that's small but produces lots of meat in proportion.
CH4 is a compound that contains carbon, two elements are present, in CH4 ( carbon and hydrogen) so it is a compound.
Answer:
Comparative anatomy and genetic analysis
Explanation:
Comparative anatomy is less reliable as it is the process of comparing two species physically to determine how related they are. This can be effective in certain cases, such as big cats, that all look similar because they are closely related. This doesn't always work though because species in similar environments can adapt similar traits for survival. For example, dolphins and sharks have fins but different ancestors. DNA analysis is more accurate. More similar DNA = closer relation between organisms.
Assimilation of external DNA into the cell