Some areas of an ocean are known as dead zones. These zones form when algae decomposes after an algae bloom. The increased number of decomposing algae use up oxygen from the water.
Which human activity is most affected by the increasing number of dead zones in the ocean?
Sand mining, because oxygen is not available to form the sands on ocean beaches
Offshore oil drilling, because water in dead zones is toxic
Commercial fishing, because fish cannot survive without oxygen
Commercial shipping, because dead zones change the course of ocean currents
C
A favorable adaptation that occurs due to natural selection should make an organism better able to survive in their environment. How does a favorable adaptation become part of a population?
Being among the strongest organisms in a population
Being able to survive, find a mate, and produce offspring that have the adaptation
Being able to survive long enough to reach the adult stage
Being able to escape from predators
D
The table lists some organisms found in a swamp ecosystem and their sources of energy.
Swamp Ecosystem Data
Organism
Energy Source
Raccoon = Frogs, bird eggs, fish, insects, snails, reptiles, plants
Carp=Plants, mosquito larvae
Blue heron=Fish, frogs
Alligator=Frogs,turtles,birds, fish, raccoons
Leopard frog=Insects
Orchid=Sunlight
Mud turtle=Fish, snails, tadpoles, plants, worms, insects
Which of the organisms above would receive the least amount of energy from the food they consume?
Turtle
Alligator
Orchids
Carp
B
To fight a bacterial infection, a patient was given an antibiotic to take for 10 days. After the patient finished taking the antibiotics as directed, almost all the bacteria were killed. After another 10 days, the patient was sick again with the same type of infection.
What most likely happened?
Some of the bacteria were resistant to the antibiotic, and they reproduced.
The patient’s high fever inactivated the antibiotic, allowing the surviving bacteria to grow rapidly.
The antibiotic slowed the life cycle of the bacteria.
A few bacteria survived the antibiotics and stopped reproducing.
A or C
The Sun appears to rise in the morning and set in the evening because of which of the following explanations?
The Earth rotates on its axis.
The Sun’s gravity is very strong.
The Sun is much larger than the Earth.
The axis of the Earth is tilted.
A
2 answers
1 answer