<span>Oligotrophic and eutrophic lakes can be described in terms of productivity, in which an oligotrophic lake, tanks to its low nutrient level and generally inhospitable environment for life, is said to be less productive while the more life-sustaining eutrophic lake type is said to be more productive.
In general, lakes can progress from being oligotrophic when they are first formed to being eutrophic as they mature and gain the qualities of a life-sustaining ecosystem. For example, a lake that forms in a land depression caused by a receding glacier may start out with very little life and nutrients, but microorganisms that are able to gain a foothold there begin digesting and composting organic material, making for a more fertile nutrient base that beings to sustain more plant life.</span>
Answer:
ans 1. A, H, O, T, U. is not show lateral inversion
ans 2. concave mirror: Concave mirror is used by dentist, solar furnace, reflector of a torch, etc.
convex mirror: Convex mirror is used in rear view mirrors.
In first question : b......when temperature of body falls to maintain it shivering occurs
in second question : c.......it is chemical decomposition of waste and gives energy.....no
other answer matches the descriptions given.
GOOD LUCK !!!
A desert would be a good example because there is no exact source of water there unless you are in a specific one.
