Q: Chordates are defined by a set of four characteristics that are shared by these animals at some point during their? A:

OPTIONS:
- death
- response
- birth
- development

Answer: development

Problem: OPTIONS:
- egg
- dna
- meristematic
- sperm
Q: Q: What type of cells are the smallest of all human cells? A:
Answer: sperm

Problem:OPTIONS:
- meiosis
- infection
- accumulation
- mutation

Q: What is a random change in an organism's genes? A:
****
A: mutation

Q: What is the top part of water able to receive enough sunlight for photosynthesis called? A:
OPTIONS:
- thymic zone
- synthesis zone
- fantasmic zone
- photic zone
photic zone

Q: What type of microscope is used to see extremely small objects? A:
OPTIONS:
- optical microscope
- X-ray microscope
- ultrasonic microscope
- electron microscope

Answer: electron microscope

input with options: Q: What molecules are usually insoluble in water? A:
OPTIONS:
- polar
- acids
- ions
- non-polar
output:
non-polar