The animal kingdom is made up of invertebrates (animals without bones) and vertebrates (animals with bones),
Vertebrates are divided into five classes, or subphyla.
These five classes are mammals, birds, fish, reptiles, aná
amphibians, Humans are classified as mammals, or warm-
blooded vertebrates that nourish their young with milk.
Which of the following descriptions explains what mammals are?
A. The five classes of vertebrates
B. Warm-blooded vertebrates that nourish their young with milk
C. Animals without bones
D. Invertebrates and vertebrates

B. Warm-blooded vertebrates that nourish their young with milk.

Hope this helps mate! Best of luck to you. :)

in this passage from chapter 6 of "animal farm", by george orwell, what the author is ridiculing in this passage is the frivolity of some rules.

clover, the mare, believes she remembers that the fourth commandment forbade sleeping in beds because it was something that humans did. snowball, napoleon, and the pigs are brain-workers who look after the welfare of the farm. they are the obvious leaders because they are smart, and so they are entitled to eat the best food and sleep in beds. it is squealer, who says these lines making the difference between sleeping with sheets, what humans do, and sleeping in beds, what pigs do. the unwillingness to question authority makes the oppressed to obey without thinking.

imparadis't in one anothers arms  

the happier eden, shall enjoy their fill  

of bliss on bliss, while i to hell am thrust,  

where neither joy nor love, but fierce desire,  

among our other torments not the least,  

still unfulfill'd with pain of longing pines;  

yet let me not forget what i have gain'd  

from their own mouths; all is not theirs it seems:  

one fatal tree there stands of knowledge call'd,  

forbidden them to taste: knowledge forbidd'n?  

suspicious, reasonless. why should their lord  

envie them that? can it be sin to know,