input: OPTIONS:
- low vitamin D
- radiation
- weight gain
- age Now, answer this question: Q: What causes reduction of elasticity in all organs? A:
A:
output: age

Q: Spiders use the hydrostatic pressure generated by an open type of what anatomical system to extend their legs? A:

OPTIONS:
- respiratory
- pulmonary
- vascular
- circulatory

Answer: circulatory

Problem: OPTIONS:
- strength
- work
- light
- gravity
Q: Q: What is the force that pulls downward on an object and is measured by weight? A:
Answer: gravity

Problem:OPTIONS:
- nicotine
- chewing tobacco
- alcohol
- tobacco smoke

Q: What still causes fatal lung disease in nonsmokers? A:
****
A: tobacco smoke

Q: Insects are arthropods in which class? A:
OPTIONS:
- lexapoda
- trichina
- xerophyte
- hexapoda
hexapoda

Q: The only invertebrates than can fly belong to what broad group, which is highly successful? A:
OPTIONS:
- spiders
- birds
- bats
- insects

Answer:
insects