Last week the question was: What is this worm-like critter?
This is a syrphid fly or hover fly larva. They are great predators of aphids as larvae and as adults they feed on pollen and nectar and can be good pollinators certain plants. The adults can be confused for bees but only have one pair of wings (bees have 2) and cannot sting. Larvae and adults can be found just about anywhere aphids are found. Check out this page for more more info.
Here is this week’s question: What is this? (It’s about as wide as a quarter.)