Which of these is a qualitative observation? a. The boy is 5 feet tall.
b. There are six birds in the tree.
c. The birds are tiny.
d. There are more blue birds than black birds.

What is the percent by mass of oxygen in fe2o3

How does blood clotting prevent the entry of pathogens through cuts and wounds? answer asap,, this is due tomorrow. will mark as brainliest or whatever you call it : )

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?