Spectroscopic measurements, or
measurements of wavelengths of
reflected sunlight, revealed that the
tail of Comet Hale-Bopp is made of
dust and gases such as water, carbon
dioxide, methane, and ammonia.
What does this suggest about the
composition of a comet and the
region in which comets formed?

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

cell division is not regulated in tumor cells.

whats the answer to your question?