PLEASE FILL IN THE BLANK
PART1
Investigators want to study the effects of a new growth hormone on mice. To do this, they select a population of mice that are ____________ .
One subset of the group, Group A, receives the newly developed growth hormone. This group is called a ____________ .
One subset of the group, Group C, receives no growth hormones of any kind. This group is called the ____________ .
One subset of the group, Group B, receives an already proven growth hormone. This group is called a ____________ .
Once results are analyzed, the findings show that Group A experiences a 20% increase in growth, Group B experiences a 10% increase in growth, and Group C experiences no increase in growth. These results show that the new growth hormone had ____________ on growth and works ____________ the old growth hormone.
CHOICE OF WORDS:
genetically diverse
test group
better than
control group
gentically identical
no differently than
a positive effect
a negative effect
part2
Defined as variation of life on Earth, ____________ is the number and relative abundance of different ____________ .
It is estimated that there are as many as ____________ species in the world, though as few as ____________ of these species have actually been identified.
As the human population grows and demands more resources, ____________ is threatened.
Human activities contribute to ____________ , especially in the world's coral reefs and tropical rain forests. As a result, some organisms face ____________ , or the death of their species.
Human activity has ____________ the rate of ____________ by a factor of 100 to even 1000, meaning that every day as many as 400 species face extinction.
Humans also face ____________ consequences in that we are dependent on the ecosystems we are destroying for everything from food to raw materials.
Choice of words:
decreased
habitat loss
species
2 million
positive
ecosystems
biodiversity
extinction
negative
increase
1.5 million