![]() ![]() At first, try to choose variables that you think act independently of each other.įor the first question, we need to determine how long it takes for a fragment of planarian to regenerate and become a complete animal. Sometimes variables are linked and work together to cause something. If you change more than one at a time, you will not know what variable is causing your observation. When you think you know what variables may be involved, think about ways to change one at a time. Sponges can regenerate the entire organism from just a conglomeration of their cells. After floating around for a few days, they settle down and start growing. After internal fertilization, larvae is released. Sperm is released by the “male” sponge and enters the “female” sponge. A sponge may play a female role one time and a male role the next time. ![]() During mating, one sponge plays the male role while the other plays the female role, even though both are capable of playing either role. The water brings with it bacteria and other organisms which the cells capture and filter out. The collar cells force water through the sponge which brings oxygen and nutrients while removing carbon dioxide and waste. Lining these canals are special collar cells. These canals exist to move water through the sponge’s body. ![]() A sponge is covered with tiny pores which lead internally to a system of canals and eventually out to one or more larger holes. Almost all sponges pump water to obtain nutrients and oxygen. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |