Well you can coordinate the test material by key words and subjects
Answer: Option A.
Different beaks were available
Explanation:
Variation is the difference between traits, cells, or characteristics between organisms of any species which is caused by change in genetic information or effect of environmental factors on the expression of genes.
From the question, different beaks were available because there is variation or differences in shapes, sizes and expression.
By the unequal heating of earths surface
Answer: As water is cooled, its density increases until it reaches about 4˚ Celsius.
hope this helps you :D
i apologize if i got it wrong
Answer:
Carotenoids absorb light maximally between 460 nm and 550 nm and appear red, orange, or yellow to sight.