Life on earth
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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what is a species
a group of organisms that can interbreed to produce fertile offspring
what is the population
number of organisms of one species in an area
what is a producer
a green plant that makes its own food using light energy by photosynthesis
what is a consumer
eats other organisms to obtain energy
herbivore
only eats plant material
carnivore
only eats amimal material
omnivore
eats both plant and animal material
predator
hunts another organism for food
prey
organism that is hunted for food
niche
the role an organism has in the community
what do arrows in a food chain represent
the direction of energy flow
what is a food web
food chains that are intertwined with one another into more complex feeding relationships
what is interspecific competition
competition between members of different species for one or a few resources
what is intraspecific competition
competition between members of the same species for all of their resources
what type of competition is more intense intrasepcific or interspecific
intraspecific beacuse the members of the same species need the same resources
what is the three ways that energy is lost in a food chain
movement, heat , undigested materials/food
why will a pyramid of energy always be a true pyramid shape?
becayse energy is always lost at each stage
what is a pyramid of energy
a oyramid that shows the energy available at each stage in a food chain
what is a pyramid of numbers
a pyramid that shows the number of organisms at each stage in a food chain
what is ment by biotic factor
a factor directky related to living organisms
what are some examples of biotic factors
food availability, predators, disease, competition, grazing and predation
what is ment by abiotic factors
non living factors
what are some examples of abiotic factors
temperature, ph, moisture, light intensity