Giraffe Characteristics. The giraffe is the tallest living animal which is instantly recognizable by its exceptionally long neck. Adult males stand 15 â 19 feet (4.6 â 6.0 metres) tall, whereas females are shorter at 13 â 16 feet (4 â 4.8 metres) tall.
Bacterioplankton are bacteria and archaea, which play an important role in remineralising organic material down the water column (note that many phytoplankton are also bacterioplankton). Plankton are found throughout the oceans, seas and lakes of Earth.
Noun. 1. phytoplankton-photosynthetic or plant constituent of plankton; mainly unicellular algae. plant life, flora, plant - (botany) a living organism lacking the power of locomotion. plankton-the aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water.hyÂ·toÂ·plankÂ·ton. n. Plankton that consists of minute plants and other photosynthetic organisms, including cyanobacteria, diatoms, and dinoflagellates. phyâ²toÂ·plankÂ·tonâ²ic (-plÄngk-tÅnâ²Ä­k) adj.