In this sentence, which words should be replaced with more precise language?

the two research groups should not be exactly the same.

exactly the same
should not be
research groups should
two research groups

1. while some people only consider the cute little bundle of fur, there are many daily rituals of pet ownership. 2. one of the biggest surprises of adopting a puppy is how much exercise it needs on a daily basis. 3. the cost of food, the veterinarian and general supplies is another surprise to many new dog owners. 4. adopting a puppy is a hefty responsibility. read the four sentences and determine which answer shows the most logical order. a) 1, 4, 3, 2 b) 2, 3, 1, 4 c) 3, 2, 4, 1 d) 4, 1, 2, 3