A change in which of the following is least likely to impact primary productivity? A. Nitrate
B. Dissolved oxygen levels
C. Dissolved carbon dioxide levels
D. Phosphate

Ascientist discovers a new body between the orbit of neptune and the kuiper belt. the object is round and travels in an orbit around neptune with other space objects. the scientist claims that she has found a new dwarf planet. where is the scientist’s error?

How does human environment effect the biosphere

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