Salmon begin life in freshwater streams. as they mature, they swim towards the ocean to spawn. they must change physically over several months before they reach the ocean in order to be able to survive there.

Why do mountaineers become breathless as they reach high altitudes

Describe the trends in electron configuration in the periodic table by selecting the terms from the drop down menus

Me what would happen if a plant could carry out photosynthesis, but not respiration? question 1 options: it would have no food. it would have too much water. it would be unable to capture the energy in sunlight. it could make food but not break it down for energy.