question: How do squids reproduce?
Options:
- (A) while flying
- (B) seeds
- (C) split in two
- (D) electrically
- (E) sexually
- (F) asexually
- (G) movement
- (H) fertile
answer: Mollusks reproduce sexually. Interestingly, a squid is also a mollusk. Squids reproduce sexually.
The answer is (E)

question: Many plants respond to the days growing shorted by doing what?
Options:
- (A) colder and wetter
- (B) scattering seeds
- (C) resistance activities
- (D) Decrease bodily water
- (E) evaporation
- (F) Exfoliation
- (G) bending light rays
- (H) reusing materials
answer: Many plants respond to the days growing shorter in the fall by going dormant. When the growing season ends, plants become dormant or scatter seeds and die. Many plants respond to the days growing shorted by scattering seeds.
The answer is (B)

question: Heavy metals are _.
Options:
- (A) emissions
- (B) dangerous
- (C) bent
- (D) homogenous
- (E) antigens
- (F) vehicles
- (G) fossil fuels
- (H) heat energy
answer: Antigens are molecules that the immune system recognizes as foreign to the body. Heavy metals are, in general, foreign to the body. Heavy metals are antigens.
The answer is (E)

question: Vertebrate chordates have what part of the skeletal system?
Options:
- (A) spinal column
- (B) hard bones
- (C) aerobic capacity
- (D) cartilage bones
- (E) critical organs
- (F) joints
- (G) fur and fat
- (H) graptolites
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Vertebrate chordates have a backbone. Invertebrates are animals who lack a backbone or spinal column. Vertebrate chordates have a spinal column.
The answer is (A)