Answer:
Option C, Paramecium
Explanation:
Complete question
Which of these organisms contains no specialized cells?
a. Sea anemone
b. Jellyfish
c. Paramecium
d. Sponge
Solution -
Paramecium consists of only cell and hence the chance of it having specialized cells is nill. Its size is somewhere around between 50 to 300 micrometer. It belongs to kingdom Protista and is a single celled eukaryote. While on the other hand sea anemone, sponge and jelly fishes are multicellular with various special structures such as tentacles, cilia , flagella. Hence, these three must be having specialized cell.
Answer:
<em>The correct option is D) the natural extinction rate</em>
Explanation:
Extinction can be described as a process due to which species get removed from the world.
Background extinction can be described as the standard rate of extinction of organisms of a species due to ecological or environmental factors. It is a low-level type of extinction which occurs over a long period of time. It can be described as the natural extinction rate of individual organisms. Hence, option D best describes the natural phenomenon of background extinction.
Alot, a new discovery is not overexploited
Answer:
Radiation from the lamp reaches the soil and causes the soil to warm.
Answer:
D. increased blood glucose, decreased GI peristalsis, and increased heart rate and blood pressure
Explanation:
Activation of the sympathetic division under any emergency or stress conditions results in a series of physiological responses collectively referred to as flight or fight response.
The sympathetic nervous system causes an increase in heart rate and blood pressure. Increased pumping of blood through the heart ensures enough supply of oxygen to muscles required to produce the desired responses.
It also causes constriction of blood vessels that supply gastrointestinal tract and reduced muscular activities of smooth muscles of GI trait. The result is reduced blood flow through these tissues, reduced peristalsis and slowing of digestive activities, which are not required during exercise. The sympathetic nervous system also triggers the release of glucose by the liver increases blood glucose level.