Planarias are flat worms that live freely in freshwater and sometimes in teh logs, soil, plants, or other dump or humid areas. They are from the class of Turbellarians. They have a very good ability in regeneration. They are acoelomerate which means that their body is very solid without any hollows.
They excrete unwanted objects from their body using their excretory system which is consists of series of tubes with length similar to their body length. The flame cells remove excess water through the use of the cilia and pass them to the ducts. At the end of the duct, there exist pores called the nephridiapores.
Answer:
Two ways organisms join a population are birth rate and immigration. Two ways they leave are death rate and emigration.
The bottom region of oceans and bodies of fresh water is called ____
Two factors that determine where an organism lives in aquatic ecosystem are _____ and _____
Coastal upwelling zones are home to numerous species because the water coming off the bottom of the ocean is _____
Answer:
A.respiratory and circulatory
Answer:
When higher levels of carbon dioxide is present in the environment and a mustard plant seedling is transferred to an environment, the new leaves have a lower stomata-to-surface-area ratio, it is because the concentration of carbondioxide is high in the surrounding so the plant produce small leaves having less number of stomata. If the concentration of carbondioxide is lower so big leaves are produced having maximum number of stomata.
