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Upper Elementary Science - I
2.16 Life Cycles
Which came first, the chicken or the egg? It is impossible to answer this question because life is a cycle, with no beginning or end, that keeps going around and around.
The cycle of life has four parts:
birth, growth, reproduction, and death.
: All eggs look the same.
: The purpose of the egg yolk is
to provide food for the developing chick.
to keep the yolk from moving
to keep the chick warm
: An egg is protected by the
: Most mammals develop eggs within their bodies.
: Another word for the seed in the egg that produces life is
the shell lining
: The twisted strands within the egg
protect the chick from cold
keep the yolk from moving
: A ____________ is the length of time between birth or hatching and death.
: A species is
a group of living things that lay eggs
a group of living things that fly
a group of living things that can produce living things of the same kind
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