Question

12
every year in haskell, tx we can observe and massive increase in the amount of grackles, the black birds you can see in parking lots or on phone wires. these grackles are flying south to avoid the colder northern winters. what is the act of flying south seasonally called?
limiting factors
biotic potential
emigration
migration
13
during the middle ages and throughout the renaissance, cities in europe suffered from outbreaks of disease that killed hundreds of thousands of people. what type of limiting factor does this type of loss due to disease fall under?
density dependent
density independent

Explanation:

Question 12

Migration is the seasonal movement of animals from one region to another. In this case, the grackles flying south seasonally to avoid cold northern winters is an example of migration. Limiting factors are things that restrict the growth of a population. Biotic potential is the maximum reproductive capacity of an organism. Emigration is when individuals leave a population, but it's not necessarily seasonal movement like in this case.

Density - dependent limiting factors are related to the density of a population. Diseases are more likely to spread in a densely populated area (like cities in Europe during the Middle Ages and Renaissance). As the population density was high, the disease (a limiting factor) had a greater impact. Density - independent factors are not related to population density (e.g., natural disasters). There is no such term as "bless dependent" or "bless independent" in the context of limiting factors.

Answer:

Migration

Question 13