A: 14
B: 1
C: 990
D: 145 km
E: 3.4
F: 250
Answer:
The correct answer is: a single layer of flattened cells.
Explanation:
The epithelium is one of the four basic tissues and has many important functions. <u>These functions are given by the specific characteristic of the epithelium considering its location.</u> For example, an epithelium that specializes in protection (for example, the one found in skin) has lots of layers in order to carry this task.
Epithelium that specializes in the passive diffusion of materials from one fluid to another needs to have a single layer of flattened cells: this way, <u>the fluids can diffuse easily than if the epithelium had many layers or cubical cells.</u>
Answer:
The presence of a larger proportion of unsaturated fatty acids in membranes imparts them fluidity at lower temperatures as required to maintain their normal functioning.
Explanation:
The proportion of unsaturated and saturated fatty acids in membranes regulates their fluidity. At lower temperatures, membranes become more rigid. To maintain their normal fluidity, the proportion of the unsaturated fatty acids in membranes is increased. The unsaturated fatty acids have double bonds in their hydrocarbon tails which in turn do not allow their tight packing and impart fluidity to the membrane core.
At higher temperatures, membranes become more fluid and therefore, the proportion of the unsaturated fatty acids is reduced. The tissues of reindeer at the body's extremities such as those near hooves are exposed to surroundings and thereby, lose heat and have lower temperatures. To maintain the fluidity of membranes, the cells of these tissues incorporate more of the unsaturated fatty acids in their membranes as compared to the tissues in the upper legs where the body temperature is relatively higher.
Stars begin to form from clouds of gas in space. The cold temperatures and high densities (compared to elsewhere in space, but would be considered a vacuum on Earth) of these clouds allow gravity to overcome thermal pressure and start the gravitational collapse that will form a star.
Decomposes are biotic (non living) and the also decompose and do not eat