A hydrangea plant has blue flowers when grown in acidic soil, but has pink flowers when grown in basic soil. A clone of the pink-flowered plant is grown in acidic soil and produces blue flowers. This change in flower color is most likely due to

At one point, scientists observed that the ozone shield was getting thinner. They warned that the loss of the effectiveness of this shield may lead to an increase in

Before a cell divides, an exact copy of each chromosome is made by the process of

In a portion of a gene, the nitrogenous base sequence is T-C-G-A-A-T. Which nitrogenous base sequence would normally be found bonded to this section of the gene?

A change in the sequence of T, G, A, and C would result in

In order for new species to develop, there must be a change in the

Some behaviors such as mating and caring for young are genetically determined in certain species of birds. The presence of these behaviors is most likely due to the fact that

Many scientists believe that the earliest cells on Earth were relatively simple, lacking nuclear membranes and other organized cellular structures. Over time, more complex cells developed from these simple cells. These statements describe the concept

All of Earth's water, land, and atmosphere within which life exists is known as

The science of ecology is best defined as the study of

Which statement best describes a situation where competition occurs in an ecosystem?

Some scientists have collected and stored seeds for many types of food-producing plants. The purpose of this is to

The hemlock wooly adelgid is an invasive insect species that is destroying native hemlock trees in New York State. These insects can upset natural ecosystems because they

Which type of biome occupies the largest area of Earth?

If the temperature of the tissue samples used in an experiment had been raised from 37°C (body temperature) to 50°C, the results would have been different because

A scientist at a large natural history museum has a collection of fossils that were found throughout the world. Only a few of the fossils represent species that are still alive on Earth today. One reason for this is that

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