changes in ecosystems
moon
phases and planet
animal growth and reprodution
100
people change ecosystems by bringing new ______ or _______ into them.
What is plants,and animals.
100
how many planets are their.
What is 8
100
each strand is called __________.
What is chromosome
200
_______ make ponds by building dams.
What is beavers
200
how many earth days is it for Mercury to get around the sun in one full spin.
What is 88
200
the process of a cell is called _______.
What is mitosis
300
what has craters
What is earth and the moon
300
this type of reproduction without the joining of male and female cells is called _______ _________.
What is asexual reprodution
400
a species that is _______ has no members of its kind alive.
What is extinct
400
pulled by the sun's gravity,the Earth - moon system ________,or travels in a closed path,around.
What is revolves
500
A _________insects. is a poison that kills
What is pesticide
500
how many earth days does it take for Pluto to get around the sun in one full spin.
What is 90,777.6
500
_______ is the process number of cells that reduces the number of chromosomes in reproductive cells.
What is meiosis
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