{science question} -photosynthesis-
the taiga is a forest region in the northernmost part of the world. this region is very cold, and winters are long. most of the trees there are conifers, and many keep their green needles all year-round. why do you think the needles are important for the trees’ survival?

The small bags of silica gel you often see in a new shoe box are placed there to control humidity. despite its name, silica gel is a solid. it is a chemically inert, highly porous, amorphous form of sio2. because water vapor readily adsorbs onto the surface of silica gel, it acts as a desiccant. despite not knowing mechanistic details of the adsorption of water onto silica gel, from the information provided you should be able to make an educated guess about the thermodynamic characteristics of the process. predict the signs for δg, δh, and δs for the adsorption of water.