A caterpillar changing into a butterfly
horses becoming taller and faster over millions of years
humans brains becoming larger over time
all species of tortoises in the galapagos islands descending from a common ancestor.
a feature that allows an organism to better survive in its environment is a(n):

a. variation
b. adaptation
c. dna molecule
d. fitness

The correct answers are explained below:

Explanation:

The change or transformation of a caterpillar into a butterfly is known as Metamorphosis. A butterfly has four stages in its life-cycle. They are, eggs, caterpillar or larva, pupa and adult butterfly. Therefore, the metamorphosis of a caterpillar into a butterfly forms a part of its Life-cycle.Horses becoming taller and faster over millions of years, increase in size of human brain and different species of tortoise in Galapagos island which descend from a common ancestor are examples of Adaptation. Adaptation can be defined as the phenomenon due to which organisms undergo various types of physical, biochemical, physiological and metabolic changes in them over long periods of time by the process of evolution in order to adjust themselves to the environment they are exposed to in the best possible manner.A feature that allows an organism to better survive in its environment is a(n): Adaptation.

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.