Question 1

Question

A) How have the historic levels of melanin in human populations changed due to migration?
(1 point)
Humans that produced less melanin became more common as populations migrated away from the
equator.
Humans that produced more melanin became more common as populations migrated away from the
equator.
Humans that produced less melanin became more common as populations migrated toward the
equator.
Humans that produced more melanin became more common as populations migrated toward the
equator.
Question 2
A) How would reducing low-growing plants from an area impact a population of tortoises with two
varieties of neck extension ability: short and long distance? (1 point)
The variety of tortoises that could only extend their necks a short distance would go extinct.
The proportion of tortoises that could only extend their necks a short distance would increase.
The proportion of tortoises with the ability to extend their necks a long distance would increase.
The variety of tortoises with the ability to extend their necks a long distance would go extinct.
Question 3
A) In an ecosystem, there are two color varieties within a species of toads: brown and green. Over
50 years, the proportion of the population that is green increases from 20% to 50%. Which
statement is the most likely to explain this change? (1 point)
The environment changed such that toads that can jump higher into the trees to survive better.
Pollution caused a decrease in the proportion of brown toads.
The environment changed such that green toads can blend into their surroundings better.
A disease caused a decrease in the proportion of brown toads.
Question 4
A) In an ecosystem where most flowers are long and bell-shaped, there are two varieties of
hummingbird: birds with short beaks and birds with long beaks. What is the most likely
hummingbird population composition? (1 point)
only short-beaked hummingbirds
more short-beaked hummingbirds
only long-beaked hummingbirds
more long-beaked hummingbirds
Question 5
A) 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? (1 point)
The proportion of white-furred rabbits in the population increases.
Both white- and brown-furred rabbits increase.
The proportion of white-furred rabbits in the population declines.
Both white- and brown-furred rabbits decline

Answer 1

Here are the answers to your questions based on biological and ecological principles:

Question 1
A) How have the historic levels of melanin in human populations changed due to migration?
Answer: Humans that produced less melanin became more common as populations migrated away from the equator.

Question 2
A) How would reducing low-growing plants from an area impact a population of tortoises with two varieties of neck extension ability: short and long distance?
Answer: The proportion of tortoises with the ability to extend their necks a long distance would increase.

Question 3
A) In an ecosystem, there are two color varieties within a species of toads: brown and green. Over 50 years, the proportion of the population that is green increases from 20% to 50%. Which statement is the most likely to explain this change?
Answer: The environment changed such that green toads can blend into their surroundings better.

Question 4
A) In an ecosystem where most flowers are long and bell-shaped, there are two varieties of hummingbird: birds with short beaks and birds with long beaks. What is the most likely hummingbird population composition?
Answer: More long-beaked hummingbirds.

Question 5
A) 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?
Answer: The proportion of white-furred rabbits in the population declines.

Let me know if you need any further clarifications or details!