3. Different batteries use different combinations of metals, and sometimes non-metals like (1) _______. Rechargeable batteries are engineered to avoid issues that result in a bunch of side reactions that produce useless (2) _______. Recycling batteries prevents potentially toxic battery metals from leaking into the (3) _______.

How many correct answers did you find? 🤔

5 - ❤️
4 - 🔥
3 - 👏
2 - 🤔
1 - 🤨

3. One hypothesis suggests that the hiccup is a relic of the ancient transition from (1) .......... to (2) ........... True hiccups are found only in (3) .......... and are not retained in birds, lizards, turtles, or any other exclusively air-breathing animals.

3. In childhood, brain regions involved in (1) ________ learning develop quickly. The prefrontal cortex is responsible for (2) ________ control and inhibition. The hippocampus is the brain’s memory center and tends to (3) ________ late in adulthood.