How would a bar magnet orient itself to this planet’s magnetic field
a.) a
b.) b
c.) c
d.)d

A bar magnet orient itself to the opposite polarity of planet’s magnetic field  

As we know that the earth acts like a very big but a weak magnet and that's why compasses point north. If we take a bar magnet and let it hang freely by the help of a string then we will see that the magnet's north pole would point to the Earth's south pole. and the magnet's south pole would point to the Earth's north pole and that is because we know that opposite poles attract each other.

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.