the danger of PCBs were not always known. What is one detail from that article can help you make that inference

Suggest why placing wheels under a heavy box reduces the neccessary force required to push it along at a constant speed.

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.

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.