What is involved in the process of artificial selection?
• A. An organism with a beneficial trait is more likely to survive.
• B. An animals' genes undergo a mutation that produces a certain trait.
• C. Animals mate randomly, and a beneficial trait emerges in the offspring.
• D. Humans select animals to breed that create offspring with desired traits.
D. Humans select animals to breed that create offspring with desired traits.
Cells contain a certain structure that acts as a gatekeeper in order to maintain homeostasis. This gatekeeper controls what is able to enter and exit the cell. Plant cells produce oxygen as a waste product. What cell structure allows this oxygen to pass into the environment?
• A. chloroplast
• B. vacuole
• C. endoplasmic reticulum
• D. cell membrane
D. cell membrane
The digestive system includes groups of tissues that absorb nutrients from food that has already been broken down. What is the best way to classify this group of tissues?
• A. an organelle
• B. an organ system
• C. an organ
• D. an individual organism
B. an organ system
Michael almost gets into an accident in his car. How does his organ systems respond to this event?
• A. All of his organ systems stop working.
• B. His heart beats faster and his breathing rate increases.
• C. His respiration rate slows down.
• D. All of his neurons become paralyzed for ten seconds.
B. His heart beats faster and his breathing rate increases.
Which biome has a permanently frozen layer of soil called permafrost?
A. savanna
•
B. grassland
C. tundra
D. taiga