input: OPTIONS:
- weight
- nitrogen
- adaptation
- oxygen Now, answer this question: Q: Birds have evolved a respiratory system that enables them to fly. flying is a high-energy process and requires a lot of this? A:
A:
output: oxygen

Q: What part of the cell controls what enters and leaves? A:

OPTIONS:
- nucleus
- protein
- organism
- membrane

Answer: membrane

Problem: OPTIONS:
- electrolysis
- absorption
- hydration
- osmosis
Q: Q: Water follows where sodium ions lead, due to what process? A:
Answer: osmosis

Problem:OPTIONS:
- currents
- dew
- waves
- tides

Q: What is the term for when the water of the ocean slowly rises and falls? A:
****
A: tides

Q: What is damaged in the inner ear by loud sounds that cause hearing loss? A:
OPTIONS:
- tympanic membrane
- ear drum
- hammer and anvil
- hair cells
hair cells

Q: What type of reproduction begins when an egg and sperm combine? A:
OPTIONS:
- natural reproduction
- regular reproduction
- asexual reproduction
- sexual reproduction

Answer:
sexual reproduction