It is the part of the digestive tract where approx 90% of the digestion and absorption of food occurs, the other 10% taking place in the stomach and large intestine. The main function of the small intestine is absorption of nutrients and minerals.That is, absorption of the nutrients and minerals in the food ingested, usually via the mouth, at an earlier stage in the digestive process.t is the part of the digestive tract where approx 90% of the digestion and absorption of food occurs, the other 10% taking place in the stomach and large intestine. The main function of the small intestine is absorption of nutrients and minerals.
Green seaweeds. Characteristics: Green colour from chlorophyll a and b in the same proportions as the 'higher' plants; beta-carotene (a yellow pigment); and various characteristic xanthophylls (yellowish or brownish pigments). Food reserves are starch, some fats or oils like higher plants.
Plant-Like Protists (Red, Brown, and Green Algae) 1) Red Algae: live deep in the water, can harvest light energy very well, contains chlorophyll A and phycobilins; commonly referred to as seaweeds. 2) Brown Algae: contain chlorophyll a and c and a brown pigment called fucoxanthin, largest and most complex algae, found in shallow, cool, costal water.