Invertabrate Animals???The Sponge???

Question

Ok let me ask u these questions:What is an Invertabrate?
Describe how the sponge protects itself.
Describe the Sponge(physical characteristics).
List the sponge's favorite foods.
Describe where the sponge lives(habitat).
tell what u know about the sponge's life cycle.
Tell three most interesting facts about the sponge(behaviors).

......If u can answer ALL of these questions i will pick u as BEST ANSWER!!!!So plz HELP ME!!

Answer 1

invertabrates are animals with no spines, or vertibrates. sponges also dont have any internal organs.

sponges protect themselves by having dense bones, to hook to rocks. most sea animals dont bother them much.

the body of a sponge has two outer layers separated by an acellular (having no cells) gel layer called the mesohyl (also called the mesenchyme).

Sponges are filter feeders. Most sponges eat tiny, floating organic particles and plankton that they filter from the water the flows through their body. Food is collected in specialized cells called choanocytes and brought to other cells by amoebocytes. They also eat sea bacteria.

sea-sponges live in fresh water, and cling to sea rocks and coral on the sea floor.

1. seasponges can expand themselves
2.sponges are just soft masses of cells
3.within a sponge, it's possible to find 16,000 other animals

Answer 2

an inverabrate is an animal with no backbone

Answer 3

This site seems to have all you need to know

http://www.mysticaquarium.org/index.cgi/669

An invertebrate has no skeleton