I believe the answer is a. thick layer of blubber
Mammal is an warm-blooded animal that need to keep their body warm. Organ that could insulate the heat would be beneficial to keep the temperature, like layer of fat or thick fur. The example of marine mammals would be dolphin, whale, sea lion and polar bear. Thick fur will not give much benefit for mammals in water, so only polar bear have thick fur. But all of them has thick layer of blubber, so option A will be the most appropriate.
Most likely an altimeter,
microscopes can be too heavy to carry outside,
x-ray diffraction is used to determine the molecular structure of a crystal so that is not likely to be helpful,
but an altimeter determines the altitude of an object on a fixed level, so that can be useful during a field investigation
hydrometers-measure gravity of liquids, probably not useful for a field investigation
Due to the water's polar property, water molecules attract one another<span>. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen cause </span>water<span> to be compressed together. </span><span>In general, </span>surface tension<span> decreases when temperature </span>increases<span> because cohesive forces decrease with an </span>increase<span> of molecular thermal activity. The influence of the surrounding environment is due to the adhesive action liquid molecules have at the interface.</span>
The answer to the question is c
