Sea water is a mixture of 96.5% pure water and 3.5% other material, such as salts, dissolved gases, organic substances, and undissolved particles. Its physical properties are mainly determined by the 96.5% pure water.
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Answer:
1) True
Explanation:
Cells of Sinoatrial (SA) node make up the auto rhythmic cells of heart as in normal physiological conditions , SA-node is responsible to set the pace of the rest of the heart (pacemaker) at a rate of 70 to 80 beats per minute.
The cells of SA node has the ability to self-excite thus able to generate action potential without external stimulation by nerve cells. Thus they initiate the cardiac cycle providing the conduction system.
Hence the statement , SA nodal cells are unique in that they exhibit autorhythmicity, meaning they are capable of depolarizing and firing an action potential spontaneously without any external influence, is true.
Answer:
Carboxylating pyruvate into oxaloacetate.
Explanation:
Replenishing oxaloacetate is done by carboxylating pyruvate into oxaloacetate through a process that is catalyzed by an enzyme called pyruvate carboxylase. This enzyme speed up the process and the replenishing of oxaloacetate occur quickly and the oxaloacetate is ready to function and participate in different chemical reactions.
Answer:
Earth's most productive and diverse biome is presented "in the tropics".
Explanation:
More diversity is present in the tropical rainforests. Because the tropical rainforests receive the maximum rainfall with greater average temperature. Hence, the biodiversity near these biomes are maximum. Large amount of the flora and fauna are found here, even though the nutrient of the soil is not good as the regular rainfall washes away the nutrients so the nutrient content is low. These tropical rainforest are present near the equator they are countries like Latin America, Brazil, Pacific Islands and south East Asia etc.