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absorbs things into the membrane of the cell by surrounding food in the membrane and pinching off inside the membrane
why aren't algae considered plants?
1. don't have different types of tissue - algae has all the same.
2. form gametes in unicellular gametangia(gamete chamber) in plants there is a multicellular gametangia
characteristics of algae
1. most are aquatic
2. have flagella at some point in the life cycle
3. contain pyrenoids
most are aquatic - make up phytoplankton (photosynthetic) organisms that form the foundation of aquatic food chains (make up 1/2 the worlds carbohydrates). major producer of oxygen.
groups of cells acting in a coordinated manner - some cells become specialized. divisions of labor allows algae to move, feed, and reproduce efficiently
conjugation (two protists join, exchange genetic information, and divide into 4 parts)
how sacodines feed
surround the food with protozoa, trap the food in a vesicle, release an enzyme to digest food
in oceans, many shells of calcium carbonate. the shells collect and over time create limestone
both plant and animal like, autotrophic, no cell wall.
move fast, live in digestive tracts of certain animals, abundant in water, flexible, have a pellicle.
multicellular, contain chlorophyls - mostly brown, mostly marine, plant like (seaweed/kelps), most common around rocky coasts.
thallus of brown algae
is made up of all the other parts. the blade is the top part. stipe is the stem like part in the middle. the holdfast is used to anchor the kelp to something at the bottom of the ocean/sea.
unicellular, form shells(the cell wall), made of 2 pieces that form together like a box and lid, used in toothpaste.
major part of phytoplankton, producer in both aquatic and marine food webs (at the base of the food web), release oxygen.
unicellular, 2 flagellum, cell walls are made of cellulose, most are photosynthetic autotrophs, some are red - produce toxins like red tide
always there, just not enough to cause problems. infects shellfish but not enough to make them sick. posions humans when they eat the infected fish. the poison makes humans sick and you can die.
what causes red tide?
when there are lots of dinoflagellates in the water and the temperature increases - the can divide/multiply a lot quicker. also when theres a lot of pollutions in the water.
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