Ascientist conducted an experiment to determine if temperature affects the length of a butterfly's life cycle. she collected several eggs that were laid at the same time by one butterfly, and divided them into three aquariums. each aquarium contained enough food and water for all of their lifetimes. the containers were kept at 60º f, 70º f, and 80º f.

which is the independent, or manipulated, variable in this experiment?

a, the number of days it took for adult butterflies to appear in each aquarium

b, the temperature of each aquarium

c, the number of eggs that hatched in each aquarium

d, the total number of days in each butterfly's life cycle

The correct answer is B. The temperature of each aquarium

Explanation:

In an experiment, the independent or manipulated variable is the factor that is controlled by the researcher usually as she/he changes it on purpose to determine the way this affects the main factor that is being studied, which is known as the dependent variable. According to this, in the experiment presented the temperature of each aquarium (Option B) is the independent variable because this is manipulated on purpose by the scientist to understand how this affects the length of the butterfly's life. Also, the length of the butterfly's life is the dependent variable or factor studied.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: