sarcasa said:
skeliton112 said:
sarcasa said:
skeliton112 said:
sarcasa said:
Lol first time someone actually replied to my comment. What other animals don't have eyelids?
Coral?
I think coral was not a plant nor an animal. I heard that it was some kind of things moulded into a coral... So if it's not living how the heck do you suppose it has eyebrows?
No they are animals. They are in the Anthozoa class, which is in the animalia kingdom.
references:
http://en.wikipedia.org/wiki/Anthozoa
http://tolweb.org/Anthozoa
http://en.wikipedia.org/wiki/Cnidaria
http://www.ucmp.berkeley.edu/cnidaria/cnidaria.html
How do Coral's move? How do they sense movement around them?
To be alive you do not need to "move" as in locomote. Take plants for instance. And what seperates animals from plants is not locomotion it is cell components. For instance plant cells have a cell wall and often times chloroplasts. Things you need to do to be alive:
1. Homeostasis: Regulation of the internal environment to maintain a constant state; for example, electrolyte concentration or sweating to reduce temperature.
2. Organization: Being structurally composed of one or more cells, which are the basic units of life.
3. Metabolism: Transformation of energy by converting chemicals and energy into cellular components (anabolism) and decomposing organic matter (catabolism). Living things require energy to maintain internal organization (homeostasis) and to produce the other phenomena associated with life.
4. Growth: Maintenance of a higher rate of anabolism than catabolism. A growing organism increases in size in all of its parts, rather than simply accumulating matter.
5. Adaptation: The ability to change over a period of time in response to the environment. This ability is fundamental to the process of evolution and is determined by the organism's heredity as well as the composition of metabolized substances, and external factors present.
6. Response to stimuli: A response can take many forms, from the contraction of a unicellular organism to external chemicals, to complex reactions involving all the senses of multicellular organisms. A response is often expressed by motion, for example, the leaves of a plant turning toward the sun (phototropism) and by chemotaxis.
7. Reproduction: The ability to produce new individual organisms, either asexually from a single parent organism, or sexually from two parent organisms.
The one that you questioned was number 6. They have a sence of touch on their Nematocysts (A type of venomous cell) and when touched they release poison. They fulfil every requirement to be considered alive, and their cell make up is that of an animal.