Which of the following sentences is a personal
opinion or judgment?
a
he and his peers discovered a new type of
algae that can handle warmer water.
b
researchers are not sure whether it was
evolution or if the algae was brought in from
outside the region by currents.
people still have those concerns, but they can
see that it's important to develop the tools and

People still have those concerns, but they can see that it's important to develop tools...

Explanation:

This expresses a personal judgement, because people are said to have concerns and also said to see the importance of the development of tools. The actual criteria used to determine the importance of these tools is not mentioned and is an opinion because it expresses the belief of the person that maintains it rather than an objective observation.

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.