The answer is D. Extracellular,
the main ions involve in osmoregulation in a cell are sodium and chloride. Intra-and extracellular distribution of K+ is
influenced, for example, by Na+/K+-ATPase
function, pH, Cellular catabolism and anabolism, Insulin and glucose. Parathormone
and calcitriol are important in the homeostatic regulation of phosphates. 
 
        
             
        
        
        
Elephants have multiple copies of the p53 genes that play an important role in the control of cell division.
<h3>What is the role of p53 genes in elephants?</h3>
P53 is an important regulator of the DNA repair processes and controls uncontrolled cell proliferation. When DNA is harmed, the protein becomes active and aids in orchestrating a response that stops DNA replication and fixes any incorrect copies of the cell. The oncogene MDM2 E3 ubiquitin ligase, another protein, is responsible for deactivating the p53 repair activity in duplicated cells with intact DNA since it is not required.
A human with only two alleles from a single gene has much fewer molecular anti-cancer interactions than an elephant, which has 40 alleles, or versions, from its twenty p53 genes. Although the elephant may appear to have excessive genetic diversity, each of its 40 alleles is structurally slightly different.
I understand the question you are looking for is this:
Compared to humans, elephants have a dramatically low instance of cancer. Elephants have multiple copies of the _____ genes that play an important role in the control of cell division.
Learn more about p53 genes here:
brainly.com/question/19581609
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Answer:
a-synthesizes lipids
b-assembles ribosomes
c-defines cell shape
d-produces secretory proteins
e-modifies and sorts proteins
f-digests proteins
g-generates ATP
Explanation; 
Some organelles and structures that make up the cell include; mitochondria, ribososmes, cell membrane, endoplasmic reticulum, golgi apparatus, lysosomes, among others,
-These organelles play individual roles in the cell; For instance;
Mitochondria-generates ATP 
Lysosomes; digests proteins and worn out organelles
Golgi apparatus; modifies and sorts proteins
Ribosomes; Produces proteins 
Endoplasmic reticulum; sythesis of lipids 
Cytoskeleton; it gives the cell its shape 
Nucleolus; manufactures and assembles ribosomes 
etc.
 
        
             
        
        
        
The probability of having a second child presenting the desease is 25% (i think so)