Question

developing a hypothesis
for which of these questions could a testable hypothesis be developed? check all that apply.
do childrens heart rates increase at the same speed when walking uphill?
is experimenting with moldy bread more fun than experimenting with yogurt cultures?
does temperature affect how long blood can be stored?
how does moisture affect the growth of moss on a tree?
which of leeuwenhoeks microscopes was the coolest?

Explanation:

A testable hypothesis can be developed for questions that can be investigated through experimentation or observation with measurable variables. "Do children's heart rates increase at the same speed when walking uphill?" can be tested by measuring heart - rates. "Does temperature affect how long blood can be stored?" can be tested by varying temperature and measuring storage time. "How does moisture affect the growth of moss on a tree?" can be tested by controlling moisture levels and observing moss growth. Questions about what is "more fun" or "the coolest" are subjective and not testable in a scientific sense.

Answer:

Do children's heart rates increase at the same speed when walking uphill?
Does temperature affect how long blood can be stored?
How does moisture affect the growth of moss on a tree?