Trees that are located in cities and exhibit stunted growth and abnormal leaves and buds have probably been affected by
a) lack of water
b) lack of sunlight
c) lack of proper nutrients
d) smog

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek