The most accurate classification of the common forms of coronary artery disease and hypertension is that they are complex disorders which result from gene-environment interactions. For example, almost 60% of CAD cases are found in South East Asia, that too when their population if just 20% of the total world's population. This is due to the environmental interactions with the genetic disposition of the people of this region.
Variations are beneficial for the survival of the species. Populations of organisms fill well-defined places, or niches, in the ecosystem, using their ability to reproduce.However, if some variations were to be present in a few individuals in these populations, there would be some chance for them to survive.
Answer:
Fossils are found in harsh depth and heights as they had decayed many.centuries ago
Answer:
The seed which is buried deep in the soil won't germinate
because
- it won't get sufficient oxygen / air
- it won't get sufficient sunlight
- and etc...
