Lucy is a graduate student. she regularly has muscle pain, fatigue, trouble staying asleep and an increased heart rate. lucy is experiencing symptoms of:

What must be true for natural selection to heppen

During the day, plants produce by splitting water molecules in the light-dependent reactions of photosynthesis. at the same time, plants use cellular respiration to produce some of the needed by the light-independent reactions to make sugars. during the night, plants produce because takes place.

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?