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In the spring and fall, eastern pipistrelle bats roost deep inside caves. ████ ████ ██ █████ ██ ██████ ███████ ███ ████ █████ ███ ████ ██ █████ █████ █████ ██████ ███████ ███ ████ ████ ████████ ██ ████ ██████ ████ ██ ████ █████ ███████████ █████ ████ ████ ████ ████ █████ ███ █████ ██ ████ ██████ ████ ██ ████ ███████ ████ ██████ ███ ███████████ ██████ ███ █████ █████ ███ ████ █████ ███████ █████████ ███ ████ ████ ███ █████ ██ ███ █████
"Surprising" Phenomenon
Bats leave their caves more often on warm, food-abundant nights than on cool nights, despite seemingly not having any way of knowing it’s a warm night outside the cave.
Objective
The right answer will be a hypothesis explaining how bats know it’s warm out despite their caves not changing temperature. The explanation must provide some way for bats to know the temperature without feeling the temperature directly.
4.
Which one of the following, ██ █████ ████ █████ ██ ███████ ███ ████████████ █████████
a
The researchers studied ████ ██████ █████ █████ ██████ ██ █████ ████ ███████ ██ ████ ██████ ████ ███ ███ ████ █████
b
Eastern pipistrelle bats ███ ██████ ███████ ██ ██████████ ████████ ██████ ███ █████ ████ █████████ ███████ ████ ███████ ██ ███████████ ███████ ███ ██████
c
Eastern pipistrelle bats ███ █████████ ██ ████ ███████ ██ █████████ ████████ ███████ ███ ████████ █████ ██ ████ ████ ██████ ███ ████ █████████
d
Because of the ████ ██████ ██ ██████ ███████████ ███████ ███████████ ████ ████ ██ ███████ ████ ███████ ███ ███ ██ ███ ██████ ███ ████ ████ ██ ███ ███████
e
During the periods ██ █████ ███ ███████████ ███████ ███ █████ ██ ████ ████████ ████ ████ ██ ███ ████ ████ ███ █████ ██ ██████ ██ █████