Choose of the following best describe tropism. A: Tropism is the only cause for plant growth.
B: True tropism requires plants to grow.
C: Tropism causes plants to produce tropism.
D: Tropism will cause plants to react to both internal and external stimuli.

The body is protected against harmful flu viruses by

What happens when a scientific theory is shown to be an accurate description of a phenomenon?

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?