Unique Adaptation: The stem of the rose plant has thorns all around as protection from potential predators who would seek to eat the plant.
Common Adaptation: I wouldn't say my observations have a common adaptation because they are a mix of plants and animals, but they have all adapted to the Maryland climate as some of them were transplanted and were not originally growing in the place they were.
Phylogeny Placement: Hydrangea Macrophylla
Unique adaptation: The Norway spruce has leaves like needles. This shape reduces the surface area thus prevents water from evaporating especially in dry and cold weathers.
Adaptation in common: There is no adaption in particular that all of my observations have in common, but most of them are able to survive the winter in Montreal. For animals like squirrels, they have thick coats of fur to insulate heat. Others like maples and oak, they have broad leaves to capture sunlight for photosynthesis in order to store nutrients, and they lose those leave in the Fall to reduce water loss.
Phylogeny placement for Norway Spruce : Seed plants - Gymnosperms - Picea Abies