Abiologist discovered a young, four-legged animal. the animal had lungs, seemed to fertilize internally, and its outer surface was covered with scales. in which class of animals is the biologist likely to place the animal? a. fish b. mammals c. amphibian d. reptile

The correct answer is option D. Reptiles

Explanation:

The group of animals with four legs, having lungs, fertilize internally and the outer surface is covered with scales are classified as reptiles and such animals should be placed in class reptiles. Reptiles generally have tetrapods or four-legged except few such as snakes, most of the reptiles fertilize internally and also have scales on the outer surface such as snakes.

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americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.