1)

Question

The two abiotic factors used to classify earth’s terrestrial biomes are
A) plant and animal species present.
B) trophic levels and average temperature.
C) average yearly precipitation and temperature.
D) length of growing season and amount of rainfall.
2)
Which of these is MOST LIKELY to contribute to the long-term instability of a local ecosystem?
A) storms that uproot large trees in the area
B) introduction of a non-native animal species
C) seasonal migration of birds to and from the ecosystem
D) flash floods that destroy the nests of local water birds
3)
How do beaver dams contribute to species diversity in the ecosystem?
A) provide access to food in winter
B) keep predators away from the ecosystem
C) provide a habitat for a variety of species
D) ensure that only beavers have access to water
4)
Why are coral reefs home to a huge diverse variety of species?
A) Coral reefs have all the factors necessary to support plants, predators, and prey.
B) Coral reefs keep predators, such as sharks, away providing a safe habitat for fish.
C) The presence of sunlight keeps animals away, allowing a variety of plants to thrive.
D) As deep ocean habitats, coral reefs provide a safe habitat for a variety of species.
5)

Sally is sorting plants into groups. She labels her groups as vascular and non-vascular. What plants can Sally sort into the vascular group?
A) B.
B) C.
C) B. and C.
D) A. and B. and C.
6)
Animals are divided into two groups; vertebrates and invertebrates. Animal classification is a matter of sorting out similarities and differences. This sorting process enables scientists to describe characteristics through the various levels of animal groups and subgroups. Among the most basic criteria by which animals are sorted is whether or not they possess a backbone. This single trait places an animal into one of two groups: the vertebrates (with backbone) or the invertebrates (without backbone). This represents a fundamental division among all animals.
Identify the tough external skeleton covering that protects and supports the body of many invertebrates.
A) arthropod
B) crustaceans
C) exoskeleton
D) notochord
7)

All arthropods have an outer skeleton or exoskeleton. But they are different in some other ways. Which arthropod has eight legs and could bite you with its fangs?
A) beetle
B) fly
C) lobster
D) spider
8)

Use this dichotomous key to identify the bird labeled A.
A) Purple Heron
B) White Stork
C) Spoonbill
D) Flamingo
9)

The picture shows human red blood cells. The human body contains about 5 million red blood cells per cubic milliliter. This means that the human body
A) is unicellular.
B) is multicellular.
C) has mainly one type of cell.
D) is made of nonliving matter.
10)

The illustration shows the basic unit of life. It is
A) a cell.
B) an atom.
C) a molecule.
D) an organelle.
11)

Wildlife is plentiful in the pineywoods. There are over 100 species of birds and many small mammals, like cottontail rabbits and squirrels.

What else MUST be included in the pineywoods habitat to keep populations in balance?
A) predators, like snakes
B) omnivores, like raccoons
C) more producers, like plants
D) small animals, like the opossum
12)
Living things can have a lasting effect on the physical environment. Kudzu, for example, is an invasive species introduced to America from Japan in the late 1800s. It soon spread at a rapid rate, ruining the soil, the native plant life, and forcing animals out due to lack of food.
What is another example of living organisms altering the physical environment?
A) A wolf howls at night to seek its mate.
B) After heavy rains, a mountainside has a mudslide, covering the earth below in mud.
C) Water hyacinth was introduced to a pond. In two years, the entire pond was covered in the plant.
D) After a long period of time and under the right amount of pressure, a pearl grows inside an oyster.
13)

What is a possible reason that ecosystem 2 has fewer species than ecosystem 1?
A) Ecosystem 1 may be overhunted
B) Ecosystem 2 has more available habitats
C) Ecosystem 2 may have an invasive species present
D) Ecosystem 1 may have more pollution, which will attract more species
14)
Orcas, or killer whales, are natural predators of sea otters. It has been observed that in regions where the sea otters are not present, sea urchins grow rapidly and destroy much of the natural kelp vegetation.

Which of these statements is correct in this context?
A) Kelp is the keystone species because their survival is key to the survival of the entire ecosystem.
B) Sea otters cannot be considered the keystone species because they are not the top predators in the ecosystem.
C) Sea urchins are the keystone species because they multiply rapidly in the absence of their natural predators.
D) Sea otters are a keystone species as they prevent a herbivorous species from completely destroying a plant species.

plz help!