Many plants have thorns on their stems or leaves. what is the most likely explanation for the evolution of thorns?

Which type of neuroglia is found outside of the brain?

And give a detailed description! scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. does this result support the theory of plate tectonics? why or why not?

What type of weather does tropical continental air bring in summer? hot and cloudy cool and sunny hot and sunny cool and cloudy