Q: Fact 1: Burning fossil fuels increases the carbon in the atmosphere. Fact 2: Like coal, petroleum is a fossil fuel. Given the two facts above, what does burning coal increase carbon in?

OPTIONS:
- the atmosphere
- Greenhouse gasses
- climate
- Greenhouse gases
- sunlight
- circulatory systems
- space
- carbon dioxide

A: the atmosphere

Q: Fact 1: Vertebrate chordates have a backbone. Fact 2: Invertebrates are animals who lack a backbone or spinal column. Given the two facts above, vertebrate chordates have what part of the skeletal system?

OPTIONS:
- spinal column
- hard bones
- aerobic capacity
- cartilage bones
- critical organs
- joints
- fur and fat
- graptolites

A: spinal column

Q: Fact 1: Passive immunity lasts only as long as the antibodies survive in body fluids. Fact 2: Breastfeeding provides passive and likely long-lasting active immunity. Given the two facts above, what lasts only as long as the antibodies survive in body fluids?

OPTIONS:
- recovery time from fatigue
- Food poisoning
- during the day
- Leptospirosis
- retaining heat
- breastfeeding provides
- an area swollen with pus
- Something that causes allergies

A: breastfeeding provides

Q: Fact 1: Hearing is used for sensing sound by animals. Fact 2: By nature, dogs are pack animals. Given the two facts above, how do dogs sense sound?

OPTIONS:
- Heart rate
- observe it
- sight
- hormones
- waves
- touch
- hearing
- smell

A:
hearing