Answer: B
Explanation: Traits usually die off when they are unneeded by the organism, or if the trait causes harm to the organism's survival. Through natural selection, over time, the organisms with the best combination of traits for its survival will become the dominating species, and those with weaker traits may not survive long enough to pass off their traits to future offspring.
Answer:
Explanation:
solid : a hard stern shape that cannot be drunk like a watery substance
Liquid : a watery substance
gas : a vapor like substance that travels through the air
The question is incomplete as it does not have the options which are:
A. Merocrine gland
B. Apocrine gland
C. Salivary gland
D. Holocrine gland
Answer:
D. Holocrine gland
Explanation:
Exocrine glands are the organs or the subcellular structures which secrete a substance which is excreted out of the body.
The exocrine glands are different from the endocrine glands as their secreted products are released out of the body which is not in the case of endocrine glands.
The wax is secreted by the sebaceous glands by the production of cells that break along the base of the garland with substance into the ductal system by the exocrine glands called Holocrine glands.
Thus, Option-D is the correct answer.
Holocrine glands will release whole broken open cells into their ductal system. These cells contain the stores of substance to be released by the gland. This method of secretion requires frequent cell turnover and replacement.
Answer:
c. The harmless bacteria had been transformed.
Explanation:
Fredrick Griffith carried out the first experiment that showed bacteria can get DNA by transformation in 1928.
He used two different strains of the bacteria Streptococcus pneumoniae a)type-III-S or smooth strain-Covered by a protective polysaccharide capsule hence lethal
b) type II-R or rough strain-Lacked the polysaccharide hence non-lethal
In his experiment he observed heat killed Type-III-S strain was not able to kill the mice. However, when its remains was added with rough strain then the blend was able to kill the mice.
When he collected blood from the dead mice it had live strains of both smooth and rough type.
He came to a conclusion that non-lethal type II-R strain was transformed into lethal type II-S strain by a "transforming principle" that was supposed to be the part of dead III-S strain bacteria.
