6.12A and 6.13A/B

An organism is...

• all the members of one species living in the same area

• made of a single cell

• an alien species

• a living thing

A group of similar organisms is called a(n)...

• flock

• species

• community

• friends

The community of organisms that live in a particular area, along with their non-living environment.

• habitat

• community

• ecosystem

• popuation

The table lists levels of organization in an ecosystem from least complex to most complex. Which of the following belongs in the table where the question mark is?

• class

• society

• species

• population

Which of the following describes an interaction between a biotic factor and an abiotic factor?

• a pair of birds build a nest in a tree

• a black bear uses a cave for a winter home

• a squirrel gathers nuts to store for winter

• a vulture eats the remains of a wild pig

Meat-eating desert reptiles depend on which of the following biotic factors to supply their needs?

• daytime temperature ranges above 30 degrees Celsius

• condensation of moisture on plants for drinking water

• small animals in their habitat on which they feed

• plants that bear fruits during the summer months

Which of the following lists includes only abiotic factors?

• plants, animals, average daily temperature

• rainfall amounts, average daily temperature, minerals in soil

• minerals in soil, plants, rainfall amounts

• animals, rainfall amounts, soil composition

Which of the following describes a change in a biotic factor that will be a disadvantage for a certain species of fish living around coral reefs in shallow seas?

• heavy rains lower the salinity of the water for a long period of time

• excessive cold weather lowers the temperature in the area

• other fish species, which compete for the same resources, die out

• the number of predators, such as sharks, increases dramatically

What does multicellular means?

• one cell

• no cell

• many cells

Bacteria is an example of a(n) ______ organism.

• unicellular

• multicellular

• nonliving

• mammal