Acid. <span>Solutions with a </span>pH<span> less than 7 are </span>acidic<span> and solutions with a </span>pH<span> greater than 7 are basic.</span>
Answer:

The force that blood exerts against the wall of a vessel is called <u>blood </u><u>pressure</u><u>.</u>
Class 10 - NCERT Book - definition.

It's true because all the smoke goes through your lung. :) .
1. = <u>Surface</u><u> </u><u>area</u>
Volume
= <u>(</u><u>2</u><u> </u><u>*</u><u> </u><u>1</u><u>)</u><u> </u><u>m</u><u>²</u>
(1*2*0.5) m³
= 2 m-1 (the negative 1 is an exponent).
2. for elephant,
= S/V
= 25/10
= 2.5 m-1
for pigeon,
= S/V
= 0.5/0.05
= 10 m-1
Pigeon has the larger surface area to volume ratio.
3.
= S/V
= <u>(</u><u>4</u><u>0</u><u> </u><u>*</u><u> </u><u>3</u><u>0</u><u>)</u><u>m</u><u>²</u><u> </u><u> </u><u> </u><u> </u>
(40*30*40) m³
= 0.025 m-1
4.
= S/V
= <u>(</u><u>4</u><u> </u><u>*</u><u> </u><u>6</u><u>)</u><u> </u><u>c</u><u>m</u><u>²</u>
(4*6*5) cm³
= 0.2 m-1
hope you understand. All the best!
The correct answer is A. maintaining homeostasis.
Homeostasis is a term referring to an organisms continuous process of maintaining and auto-regulating the conditions of its internal environment. Variables such as pH, temperature, and fluid balance need to be at optimal conditions in order for the organism to function properly.
In this example, the phosphate buffer system permits the organisms to maintain a constant pH in their intracellular fluid. This is one of the organism's homeostatic mechanisms.