Which of the following is an example of an external stimuli? running away from a big predator getting a headache when you are sick feeling nervous before giving a speech plants producing seeds in pods

Ageologist determines that a sample of a mineral cant be scratched by a steel nail but can be scratched by a masonry drill bit based on this information the sample mineral has to be softer than

~~16. while watching a special on animals, brianna discovers that hares tend to lose heat through their ears. based on this and what is known about surface-to-volume ratios, propose an explanation as to why hares that live in hot climates (such as the desert) have large, extended ears

Which element is found in both dna and proteins