Question

onmental factor driving a change in the snail population in cities is ______.
eing impacted by this factor is ______.
____ other factors impacting snail populations in cities.
or
or of the sidewalks and streets
e
or of eggs
ze
ount of rainfall
t be
eat island effect

choice
-and-effect relationship would you expect in cepaea nemoralis populations over generations in
ng heat island effects?
ase in the number of sunny days results in a population of snails with darker - colored shells
ll increase in reproduction results in a larger population size.
in temperature result in a population of snails with lighter - colored shells.
in the food available to snails reduces the snail population.

at some dark - shelled snails survive in cities with high heat island effects. the
ve in shaded areas that keep them cooler.

explanation?
ason is that shade keeps them cooler.
use they become darker after increased sun expos
asons they could survive, such as
ells make it hard

Explanation:

To solve this, we analyze the heat island effect and snail shell color evolution:

Step 1: Recall Heat Island Effect Impact

The heat island effect increases urban temperatures. Snails with lighter - colored shells reflect more heat, which is advantageous in warmer (heat - island - affected) environments. Darker - colored shells absorb more heat, which is less favorable in high - temperature urban settings.

Step 2: Analyze Each Option

• Option 1: A rise in sunny days doesn't directly relate to shell color evolution due to the heat island effect (focus is on temperature, not just sunniness).
• Option 2: Increased reproduction affects population size, not shell color adaptation to heat.
• Option 3: Higher temperatures (from heat island effect) favor lighter - colored shells (as they reflect heat). Over generations, natural selection would lead to more snails with lighter - colored shells. This matches the heat island - temperature - shell color relationship.
• Option 4: Food availability affects population size, not shell color adaptation to heat.

Answer:

The option stating "an increase in temperature result in a population of snails with lighter - colored shells" (the third option in the visible choices related to the heat island effect and snail population change).