Thursday, 12 December 2013
Porifera
Feeding - sponges are filter feeders and Carnivorous
Respiration - Sponges cells absorb oxygen by diffusion from water into cells as water flows through body, into which carbon dioxide and other soluble waste products such as ammonia also diffuse
Circulation - sponges do not have distinct circulatory, respiratory, digestive, and excretory systems, instead the water flow system supports all these functions. They filter food particles out of the water flowing through them. Particles larger than 50 micrometers cannot enter the ostia. sponges also
Excretion - they extract bacteria and other micro-organisms from water very efficiently
Movement - Although adult sponges are fundamentally sessile animals, some marine and freshwater species can move across the sea bed at speeds of 1–4 mm per day, as a result of amoeba-like movements of pinacocytes and other cells. A few species can contract their whole bodies, and many can close their oscula and ostia. Juveniles drift or swim freely, while adults are stationary
Reproduction - most sponges are sexually produced but some are asexually born
sponge
Sponges are animals of the phylum Porifera (meaning "pore bearer"). They are multicellular organisms that have bodies full of pores and channels. Sponges have unspecialized cells that can transform into other types and which often migrate between the main cell layers and the mesohyl in the process
Sunday, 8 December 2013
Extreme plants
corpse flower is an amazing plant because it not only looks really big and ugly but smells really bad. They say the bad smells prevents it from getting eaten and is also very rare to find. it is found in the forests of Sumatra , it's not actually one big flower it isthousands upon thousands of little male and female flowers. These exert oils, while the center collects heat. The heat of the oils create the smell that attracts beetles that will pollinate it. a mature corpse flower can weigh up to 200 pounds
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