B
Plant's cuticle is an adaptation on land that prevents the evaporation of water from the plant.
Explanation:
The cuticle is made of lipid polymers impregnated with wax. A thick cuticle covers the epidermis of the leaves and prevents of some plants to prevent the loss of water from the leaves and plants via evaporation. This is especially a significant adaptation to desert plants that need to conserve water because they receive very little annual rainfall in their environment.
Learn More:
For more on adaptation of desert plants check out;
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Answer: B. Rough strained and heat killed smooth strain kills mouse
Explanation:
Crossing over is the <span>mechanism of genetic variation results from the exchange of gene segments between non-sister chromatids.</span>
So Male is AB
and Femlae is AO
so on crossing there ;
........A ......O
A....AA... AO
B ...AB... BO
So genotypes ; AA , AO , AB, BO
And phenotypes; Blood types A, AB , B
*used dots in punnet as i do not get proper spacing !!
Considering the following;
I. Heat is not readily available to all living cells.
II. Heat at excessive amounts denatures proteins.
III. Heat does not provide the activation energy for their reactions.
IV. When a critical temperature is reached, proteins no longer function
Answer;
I and IV
Explanation;
Living cells cannot use heat to provide the activation energy for biochemical reactions because heat is not readily available to all living cells and also when a critical temperature is reached, proteins no longer function.
Too much heat can kill an organism by rendering its organelles, cells, tissues and organs permanently inoperable and un-salvageable. The same process can be observed in tissues at low temperatures, and is the cause of frostbite. This is because enzymes are denatured by high temperature and inactivated by low.
