To protect itself from herbivores, plants

a, have thorns

b, secrete toxins

c, cannot do anything because they cannot protect themselves

d, both secrete toxins and have thorns

What was the land like over 500 million years ago? what was under the sea?

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.) chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.

Can someone i have no idea of how to do this.