<span>Protists obtain food in 3 ways. They produce their own
organic molecules, ingest, and absorb.
Ingestive protists ingest food, or engulf bacteria. These protists extend their cell wall and cell membrane forming a
food vacuole around the food item. Inside the food vacuole, enzymes digest the
food. Absorptive protists on the other hand, absorb food molecules across their cell membrane which takes place
through diffusion. Absorptive protists play a key role in decomposition. They are
considered as important decomposers. Major producers like photosynthetic protists use light energy to manufacture their own food.</span>
If the cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume. When this happens, the cell must divide into smaller cells with favorable surface area/volume ratios, or cease to function. That is why cells are so small.
simpler answer: Cells are small because they need to keep a surface area to volume ratio that allows for appropriate intake of nutrients while being able to eliminate the cells waste.
<span>The autonomic nervous system
The autonomic nervous system (ANS) is the part of the peripheral nervous system that acts as a control system, functioning largely below the level of consciousness and controlling visceral functions. The ANS affects heart rate, digestion, respiratory rate, salivation, perspiration, pupillary dilation, micturition (urination), and sexual arousal. The ANS is classically divided into two subsystems: the parasympathetic nervous system (PSNS) and sympathetic nervous system (SNS).</span>
Some possibilities of why a population decreasing are:
-invasive species
-deforestation
-pollution
-habitat loss
-change in food chain/web
-oil spills
Hope this helps!
Answer:
Kinetic energy is a property of a moving object or particle and depends not only on its motion but also on its mass. The temperature of gases is proportional to the average translational kinetic energy of atoms and molecules. The motion of individual molecules in a gas is random in magnitude and direction.
