Candice learns that all magnets have two magnetic poles. which of the following observations would best support this statement?

a.) the north pole of a compass needle is attracted to the south pole of a bar magnet.

b.) when a bar magnet is cut in half, each half has a north pole and a south pole.

c.) the strength of a horseshoe magnet's magnetic field decreases as the magnet is pulled away from another object.

d.) when an electric current flows through a wire, a magnetic field forms around the wire.

correct answer: understand the different control methods available

integrated pest management is an strategy that is based on the ecosystem and try to prevent the pest and the damage caused by them by applying combination of technique like habitat manipulation, biological control and use of resistant varieties.

the main aim of the integrated pest management is not to completely eliminate the pest but to strengthen the ecosystem so that conditions are favorable for plants and unfavorable for pests.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.