Answer:
The correct answer will be option-C
Explanation:
The rhythm of the heartbeat is controlled by the pacemaker of the heart called the sino-atrial node.
The SA node generates action potentials which trigger the contraction and relaxation of the atrium and ventricles. The membrane potential generation initiates by the depolarization of the cell membrane when the L type of Ca⁺² ions opens up and calcium ions enter the cell.
This depolarizes the cell until the potential threshold is reached which lies between the -40 and -30 mV.
Thus, Option-C is the correct answer.
Answer: the core of the earth heats up the more dense part of the mantle making it less dense.<em> </em>When the less dense part of the mantle rises, the more dense part of the mantle falls, and cools off. This motion continues creating convection currents
Answer:
Because of the difference in surface area to volume ratio
Explanation:
Surface are to volume ratio is the area of an object that is exposed to the external environment (surface area), compared to the amount within an object (volume).
Therefore an elephant has a lower surface area to volume ratio than a mouse.
The smaller an object is the greater its surface area to volume ratio.
Small animals have much more surface area per mass than large animals. With so much surface area, they lose heat very quickly. So, a mouse, with a lot of surface area per mass, must spend a lot more energy to stay warm than a large animal.
Answer:
1 dominant allies are often represented with a capital letter
2 recessive allies however are represented with a lowercase latter
3 Heterozygous is The presence of two different alleles at a particular gene .
Explanation:
the first two questions where found in the passage
As for the third a heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles for example[ Hh, hh ]
