The process shows up as the spectacle of fall foliage. During the summer, leaves appear green because the predominant pigment of photosynthesis, called chlorophyll, reflects green light.

The shortened day length is the internal trigger that causes leaves to change color. When days become shorter and nights become longer, a process within the plant causes the cells around the base of ...

Hand-drawn collection for children colouring books, invitations, cards and posters. Deer, fox, hedgehog, owl, hare, raccoon, snail, squirrel, bee, mushroom, tree. Autumn background with pumpkin and ...

Browse 8,100+ autumn leaf white background stock illustrations and vector graphics available royalty-free, or search for snowflake white background or peak to find more great stock images and vector ...