Fat has twice the calories per unit weight than protein or carbohydrate sugar has, as a consequence, has the greatest survival value.

脂肪单位体重的卡路里含量是蛋白质和碳水化合物的两倍，因此，有最能维持生存的价值。

What was its survival value?

其生存价值是什么？

However, goods can be desirable for a reason other than survival value.

但是，货物不单具备生存价值，还有其它取悦人心的原因。

If intelligence has high survival value, why are so few creatures intelligent?

如果说智能有很强的生存值，那么为什么智能生物会如此之少？

Ethology is concerned with the study of adaptive, or survival value of behavior and its evolutionary history.

动物行为学是与动物的适应性，或行为上的生存价值及进化史方面的研究有所关联。