What is the difference between the nervous system of a Sponge and a Hydra? Question 3 options:

The cells in a sponge respond to the environment individually, while a hydra has a true brain

The cells in a sponge respond to the environment individually, while a hydra has a very simple netlike nervous system that allows a coordinated response to a stimulus

The cells in a hydra respond to the environment individually, while a sponge has a very simple netlike nervous system that allows a coordinated response to a stimulus

The cells in a hydra respond to the environment individually, while a sponge has a true brain

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.