Simplify the ratio by dividing both numbers by their HCF.<br><br>
&bull; Snake blood : Bat saliva = \(10 : 25\)<br>
&bull; HCF of 10 and 25 is 5.<br>
&bull; \(10 \div 5 = 2\), \(25 \div 5 = 5\)<br>
&bull; Ratio = \(2 : 5\)<br><br>
Final Answer: 2 : 5