Answer:
The well labelled diagram of a fern plant in division Pteridophyta.
Neutrons
The atomic mass is the weight of the protons and neutrons in the nucleus.
Answer:
Phytoplanktons are photosythetic organisms found near ocean surface and provide food to a wide variety of sea creatures like whale, shrimp, jelly fish etc. They also rely on nutrients such ad nitrates, phosphate for their development. They maintain a balance ecosystem and food web in ocean.