Why would it be hard to find the ideal intensity if the temperature were very hot or cold

Which characteristics must an object possess in order to be considered alive?

Species can vary in several ways. which of the following is one of darwin's ideas that was accepted by most scientists of his time due to the large number of fossils being discovered at that time? a. species vary around the world. b. species have specific adaptations to their local environment. c. species that live in seawater can also live on mountains. d. species change over long periods of time.

Name another animal that can be grouped in group s and t(i)group (i)group group s is sharp thorns (except puffer fish and porcupine)group t is poisonous sting (except snake and scorpion )*can u me with this question* pl