Answer:
First letter.
Explanation:
Acronyms use the first letter of each word for their phrase.
A few examples can include: ETA, BRB, MIA
E stimated
T ime
A rrival
B e
R ight
B ack
M issing
I n
A ction
1. dependent: mice’s weight. independent: amount of amino acid
2. dependent: plant’s height. independent: color of lights
3. dependent: amount of ammonia released.
independent: type of fish food
4. dependent: plant height. independent: temperature of water
5. dependent: tadpole’s development
independent: protein supplement or not
Sublingual, IV, IM, insufflation, Skin absorbtion, Plugging, inhalation, eye absorbtion, and of course, swallowing. Discounting Skin and eye absorbtion, youve got 7 so i would go with that.
Past and light because it takes a minute for light to get from one place to another