Each living thing is adapted to its way of life in a general way, but each is adapted especially to its own distinct class. A plant, for example, depends upon its roots to fix itself firmly and to absorb water and inorganic chemicals. It depends upon its green leaves for using the sun’s energy to make food from inorganic chemicals. These are general adaptations, common to most plants. In addition, there are special adaptations that only certain kinds of plants have.
    Many animals have adaptations that help them escape from their enemies. Some insects are hidden by their body color or shape, and many look like a leaf or a little branch. The coats of deer are colored to mix with the surroundings. Many animals have the ability to remain completely still when an enemy is near.
    Organisms have a great variety of ways of adapting. They may adapt in their structure, function, and genetics; in their development and production of the young; and in other respects. An organism may create its won environment, as do warm-blooded mammals, which have the ability to adjust body heat exactly to maintain their ideal temperature despite changing weather. Usually adaptations are an advantage, but sometimes an organism is so well adapted to a particular environment that, if conditions change, it finds it difficult or impossible to readapt to the new conditions.
    1. Some plants and animals develop superior characteristics so that they may
    A. help others of their kind get food, shelter and other things needed.
    B. survive even in extremely severe conditions
    C. become better adapted to the environments than others of their kind.
    D. result in the evolution and production of more intelligent organisms.
    2. In the first paragraph, the word "environments" could best be replaced by
    A. contexts
    B. surroundings
    C. neighbors
    D. enemies
    3. It can be inferred from this passage that the feathers of a bird care colored
    A. to frightened its enemies.
    B. to attract its enemies