Competition is most likely to occur between which two organisms?
owls and bacteria
deer and butterflies
goldfish and rabbits
grass and strawberry plants
Rocks are classified as igneous, metamorphic, or sedimentary according to
their shape
how they formed
the minerals they contain
their color
Many cells have a nucleus that contains chromosomes. These chromosones carry genes that are composed of
undigested food molecules
hormones
DNA molecules
minerals and water
How do decomposers obtain their food?
hunting and killing prey for food
changing carbon dioxide and water into food
absorbing food from dead organisms
producing food from oxygen and sunlight
Which equipment will best separate a mixture of iron filings and black pepper?
magnet
filter paper
triple-beam balance
voltmeter
Hydrochloric acid is added to a beaker containing a piece of zinc. As a result, zinc chloride is formed and hydrogen gas is released. This is an example of
photosynthesis
evaporation
a physical change
a chemical reaction
Which statement best explains why the Sun and the Moon appear to be about the same size in the sky?
The Sun and the Moon have the same diameter.
The Moon is larger in diameter and farther from Earth than the Sun.
The Moon is smaller in diameter and is closer to Earth than the Sun.
The Sun and the Moon are the same distance from Earth.
Several tomato plants are grown indoors next to a sunny window. The plants receive water and fertilizer and remain on the windowsill. What will most likely happen?
Most of the leaves on the window side will wilt and die.
The roots of the plants will grow upward from the soil.
Water droplers will collect on the leaves facing away from the window.
The stem will bend toward the window.
Populations living in one place form a
community
system
habitat
species
Which three systems of the human body function together to move and control body parts?
nervous, skeletal, and muscular
muscular, endocrine, and excretory
digestive, excretory, and reproductive
circulatory, endocrine, and respiratory
Evidence that living things have evolved over hundreds of millions of years can be found in
particles in the air
rocks containing fossils
tree rings from recently logged trees
chemicals in human hair
Which unit is used to indicate the amount of energy in food?
ounce
degree
calorie
gram
During which phase change is heat energy absorbed by a substance?
liquid to gas
gas to solid
liquid to solid
gas to liquid
Water at 20 degrees C in an uncovered pan is evaporating very slowly. What could be done to the water to make it evaporate more quickly?
Cover it.
Heat it.
Place it in the dark.
Put salt in it.
The movement of an air mass over Earth's surface causes
earthquake activity
local weather changes
global warming
ecological succession
Growth and repair in multicellular organisms are the result of
excretion
locomotion
cell division
decomposition
Which system produces most of the hormones in the human body?
circulatory
digestive
endocrine
respiratory
An object accelerates at 3 meters per second squared when a 10-newton (N) force is applied to it. Which force would cause this object to accelerate at 6 meters per second squared?
5 N
10 N
20 N
30 N
The gravitational force between the Moon and Earth depends on
their masses, only
their diameters, only
their masses and how far apart they are
their diameters and how far apart they are
Each body cell of a goldfish contains 94 chromosomes. How many chromosomes are contained in a goldfish sex cell?
23
47
94
188