Sickle Cell Anemia
Hope this helps (:
The answer is (1) !!
it is one direction, from sun to produces to consumer !!
Please rephrase the question, it doesn't make sense.
The answer to this question would be: increased food height
Giraffe becomes tall because its food height is increased. In this case, the environmental pressure on Giraffe would be the increased height of the food.
The taller giraffe has access to higher food. Then, the giraffe with the higher chance of survival in this scenario would be the giraffe with a taller height.
