I think its 2 but im not 100% sure
According to Google, in biology (or science), it means "to cover any funding for scientific research"
Answer:
1. The camera was huge but now there are ones you can hand hold
2. It took a long time for the photo to be taken. Now it takes millisecounds
3. You had to go into a "dark room" for the photos to set up. Now you can see it in secounds
4. The photos were black and white. Now you can see the photos in all colors.
Explanation:
Id say C. It makes the most sense to me.