HELP PLEASE!! Which options show some important factors that have caused human population to increase dramatically?

Choose all that apply!!

1. The Industrial Revolution and advances in production

2. Increased availability of fresh water on Earth

3. Increased availability of good soil on Earth.

4. Advances in medicine.

What organ is the first to receive nutrients that have been absorbed from the digestive tract?

Use the distance formula to determine weather each pair of segments have the same length

Which of the following best describes the expensive tissue hypothesis? brains require more energy, so the gut had to be reduced, and larger brains and tool use led to higher quality diets. increasing body size means that homo neanderthalensis had to include more fat in its diet. brains require more energy, so the gut had to be reduced as brains got bigger. brains require more fat, so the gastrointestinal viscera (gut) had to expand, and hands were needed to acquire more food.