1.true or false: it may be possible to save a significant proportion of earth's biological diversity by establishing sustainable biological reserves at 25 locations on the globe that are especially rich in species.
2
a) the root means affection or love
b) the root means food or nourishment
c) the root means hoom or habitation
d) the root means true or good
-trophic
eu-
-philia
eco-
3.what is the difference between a habitat and an ecosystem?
4.what flows through an ecosystem?
5.which type of organism comes first in a food chain?
6.what kind of energy source directly supplies nutrients to producers?
7.which of the following is most likely to threaten the survival of a species?
8.imagine a food chain that goes from photosynthetic microorganisms through fish to seals to polar bears. which organism is most susceptible to extinction?
9.from what evidence have scientists calculated the background extinction rate?

1. True. Establishing more sites for the protection of biodiversity across the world can go a long way and would have a chain reaction in the ecosystem. Thus, it will save a lot of our planet's biodiversity. 2. a. -Philiab. -trophicc. eco-d. eu-3. A habitat is where certain species, animals, or organisms naturally live, feed, reproduce, etc. Examples: ocean, rainforest, deserts. An ecosystem has two components: living and non-living organisms which interact with each other to maintain homeostasis. The primary difference between the two is the presence of interaction between the things in the environment.4. Energy5. Producers6. Sun7. (No choices provided) One of the top factors that threaten the survival of species is caused by humans, man-made phenomena. 8. Polar bears. Polar bears are endangered species and there are only approximately 20,000-30,000 polar bears left in the world. Their population had been decreasing due to habitat loss because of climate change. 9. Scientists based the background extinction rate on the number of known species that went extinct over a period of time in the past. They also based it on archaeological evidence of species that existed and went extinct years ago. 

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it