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1. How have the historic levels of melanin in human populations changed due to migration?
A. Humans that produced less melanin became more common as populations migrated toward the equator
B. Humans that produced less melanin became more common as populations migrated away from the equator
C. Humans that produced more melanin became more common as populations migrated away from the equator
D. Humans that produced more melanin became more common as populations migrated towards the equator
2. How would reducing low-growing plants from an area impact a population of tortoises with two varities of neck extension ability: short and long distance?
A. the varity turquoise that could only extend their necks a short distance would go extinct
B. the proportion of tortiises that could only extend their necks a short distance would increase
C. the varity turtuosie that could only extend their necks a long distance would go extinct
D. the proporttion of tortises that could only extend their necks a long distance would increase
3. In an ecosystem, there are two color varites within a species of toads: brown and green. Over 50 years the proportion that is green increases from 20% to 50%. Which statement is most likely to explain this change?
A. a disease aused a decrease in the population of brown toads
B. the environment changed such that green toads can blend into their surroundings better
C. polluiton caused a decrease in the proportion of brown toads
D. the environment changed such that toads can jump higher into the trees to survive better
4. In an ecosystem where most flowers are too long and bell shaped, there are two varities of hummingbird: birds with short beaks and birds for long beaks. What is the most likely hummingbird population composition?
A. more long beaked humming birds
B. more short beaked humming brids
C. only short beaked hummingbirds
D. only long beaked hummingbirds
1. How have the historic levels of melanin in human populations changed due to migration?
A. Humans that produced less melanin became more common as populations migrated toward the equator
B. Humans that produced less melanin became more common as populations migrated away from the equator
C. Humans that produced more melanin became more common as populations migrated away from the equator
D. Humans that produced more melanin became more common as populations migrated towards the equator
2. How would reducing low-growing plants from an area impact a population of tortoises with two varities of neck extension ability: short and long distance?
A. the varity turquoise that could only extend their necks a short distance would go extinct
B. the proportion of tortiises that could only extend their necks a short distance would increase
C. the varity turtuosie that could only extend their necks a long distance would go extinct
D. the proporttion of tortises that could only extend their necks a long distance would increase
3. In an ecosystem, there are two color varites within a species of toads: brown and green. Over 50 years the proportion that is green increases from 20% to 50%. Which statement is most likely to explain this change?
A. a disease aused a decrease in the population of brown toads
B. the environment changed such that green toads can blend into their surroundings better
C. polluiton caused a decrease in the proportion of brown toads
D. the environment changed such that toads can jump higher into the trees to survive better
4. In an ecosystem where most flowers are too long and bell shaped, there are two varities of hummingbird: birds with short beaks and birds for long beaks. What is the most likely hummingbird population composition?
A. more long beaked humming birds
B. more short beaked humming brids
C. only short beaked hummingbirds
D. only long beaked hummingbirds
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Biology
Expert-Verified
In an ecosystem, the average temperature increases, causing a shorter winter. There are two varieties of rabbits in this area: white-furred rabbits and brown-furred rabbits. Which scenario is most likely?
In an ecosystem, the average temperature increases, causing a shorter winter. There are two varieties of rabbits in this area: white-furred rabbits and brown-furred rabbits. Which scenario is most likely?
A. Both white- and brown-furred rabbits increase. B. Both white- and brown-furred rabbits decline. C. The proportion of white-furred rabbits in the population declines. D. The proportion of white-furred rabbits in the population increases.
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Biology
Expert-Verified
In an ecosystem, the average temperature increases, causing a shorter winter. There are two varieties of rabbits in this area: white-furred rabbits and brown-furred rabbits. Which scenario is most likely?
In an ecosystem, the average temperature increases, causing a shorter winter. There are two varieties of rabbits in this area: white-furred rabbits and brown-furred rabbits. Which scenario is most likely?
A. Both white- and brown-furred rabbits increase. B. Both white- and brown-furred rabbits decline. C. The proportion of white-furred rabbits in the population declines. D. The proportion of white-furred rabbits in the population increases.
Answered by
GPT-4o mini
1. **D. Humans that produced more melanin became more common as populations migrated towards the equator.**
As populations migrated towards the equator, higher UV radiation levels favored individuals with more melanin, which provides protection against UV damage.
2. **D. the proportion of tortoises that could only extend their necks a long distance would increase.**
If low-growing plants are reduced, tortoises with longer necks would have a feeding advantage, leading to an increase in their population proportion.
3. **B. the environment changed such that green toads can blend into their surroundings better.**
If the proportion of green toads increased significantly over 50 years, it suggests that environmental changes favored green toads, possibly providing better camouflage against predators.
4. **A. more long-beaked hummingbirds.**
In an ecosystem where most flowers are bell-shaped and long, hummingbirds with long beaks would likely have a feeding advantage, leading to a higher proportion of long-beaked hummingbirds in the population.
As populations migrated towards the equator, higher UV radiation levels favored individuals with more melanin, which provides protection against UV damage.
2. **D. the proportion of tortoises that could only extend their necks a long distance would increase.**
If low-growing plants are reduced, tortoises with longer necks would have a feeding advantage, leading to an increase in their population proportion.
3. **B. the environment changed such that green toads can blend into their surroundings better.**
If the proportion of green toads increased significantly over 50 years, it suggests that environmental changes favored green toads, possibly providing better camouflage against predators.
4. **A. more long-beaked hummingbirds.**
In an ecosystem where most flowers are bell-shaped and long, hummingbirds with long beaks would likely have a feeding advantage, leading to a higher proportion of long-beaked hummingbirds in the population.
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