Depending on breed, management and environment, the domestic horse (including draft horses) today has a life expectancy of 25 to 35 years. It is uncommon, but a few animals live into their 40s and, occasionally, beyond. The oldest verifiable record was Old Billy, a 19th-century horse that lived to the age of 62.
TRUE. Validity is a necessary condition for being sound. 14. FALSE. A valid argument can have a true conclusion and false premises (see #11); and if an argument does not have all true premises, then it is not sound.
5 (6) Generally, these two groups of reasons will be different because an (a) argument and a causal explanations have different goals, and (b) a causal explanation assumes that its conclusion is true, but an argument attempts to show that its conclusion is true.