#5 Commensalism is a kind of coexistence where one organism is
benefited and the other is not affected. The Russian blue house cat above is a
family pet. It is fed and sheltered by the humans, but does not give or take
anything (useful) from the humans.
#6 Competition is the natural competition between organisms for
survival, resources, mates, or status. These two hunting dogs are competing for
a bowl of food.
#8 Endosperms are plants that, when fertilized, have an embriotic
structure. Peanuts, for example, grow a shell and develop seeds inside by
providing it nutrients.
#13 A nich is a specific area in which an organism can survive.
The above photo shows a dirt bug. It only lives in the dark areas of dirt
filled areas near a food source. The potted plants in my house are perfect
places for these dirt pests.
#14 Parasitism is a kind of coexistence where one organism
benefits and the other organism is at a disadvantage. In the photo (just above
the rim of the food bowl) a rat is seen stealing food out of the hornbill's
food bowl. It puts the hornbill at a disadvantage because it is taking its
food, as well as risking the spread of diseases.
#16 A food chain is a line that specifies the predators and prey
of a certain area. It usually consists of a primary producer, an
herbivore, a carnivore, and a decomposer. The above series of photos shows
four organisms involved in one of the most popular food chains: the African
lion food chain. The lion eats both giraffes and zebras. The giraffe gets its
sustenance from the indigenous trees.
#18 A population is the general number of a species in a certain
area. In the picture above, there is clearly a population of ducks at the
Sacramento Zoo. Members of this population rarely move from this area.
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