Review!

Organize from simplest to most complex!

• tissues, cells, organs, organism

• cells, tissues, organs, organ systems, organism

The physical expression of a trait in an organism is known as

• chromosome

• genotype

• phenotype

• double helix

Where is water most likely to become contaminated?

• At the ocean bottom

• Near a cattle farm

Which is an abiotic change in an ecosystem?

• Fish species populations increase.

• Annual rainfall totals for an area increase.

Which characteristic is used to classify frogs into a different phylum from squid, snails, and jellyfish?

• Frogs are predators.

• Frogs have backbones.

Which organelle do plant cells contain that animal cells do not?

• ribosomes

• chromosomes

• chloroplasts

• mitochondria

Which facility relies on a nonrenewable source of energy?

• A wind farm

• A dam that uses the power of water

• A power plant that burns coal

Day and night are caused by

• the tilt of the Earth

• the tides

• the rotation of the Earth on it's axis

Why is water known as the universal solvent?

• It dissolves the greatest number of substances.

• It only dissolves solids.

What do the the outer planets have in common?

• They all have solid surfaces.

• They are all made of gas.