Science Reflection by Justin Yau

At the Wu Kai Sha mudflats I learned and observed a lot. I found out that just a beach contains numerous creatures. They were both small and big, each had different habitats. For example the black crabs usually lived under rocks and the smaller, white ones usually lived in holes. I observed that animals lived where food in plentiful, for example the crabs lived were the sand was moist and wet, where more microscopic creatures lived. I learned that animals lived where it is safe or camouflage to their body color, for example black crabs lived under large black rocks, and they were both protected by the body color and the rock from the outside environment. I learned that there was black mud under sand. Called iron sand, they were mainly created by bacteria that ate up the creatures in the sand making it smell like rotten eggs. I learned a lot on the science field trip.