Answer: 1,2,3
Explanation:
1. One of the major function of the kidney is to excrete metabolic waste. When the blood is perfused through the Bowman's capsule, an ultrafiltrate of the blood is produced in the glomerulus, the filtrate in Bowman's capsule contains salt, glucose, amino acids, nitrogenous waste, etc while the cells and proteins are retained in the blood. The waste are excreted as urine or uric acid.
2. One of the function of the renal tubule is to maintain fluid and electrolytes balance. When the glomerulus filtrate is formed, it contains almost all the crystalloids of plasma which includes water, Na+, Cl-, glucose, amino acid and K+. The renal tubule reabsorb water and solute to the blood to maintain water and electrolytes balance.
3. The kidney secrete a hormone Renin, which control other hormones angiotensin and aldosterone that helps to control blood pressure.
We use the classification system when grouping organisms, which are very diverse. The sub-group with the least amount of diversity is the species. The measure of diversity in this classification will of the variation in genome and physical characteristics. The species have a slight variation in the genome and phenotype compared to the amount of variation in a genus, where related species are clubbed together. The amount of diversity increases from the nodes of a classification tree to its root or parent (kingdom).
Producers provide oxygen gas as a result from photosynthesis - something that almost all other organisms at high trophic levels need
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