The evidence that scientists currently have suggests that life on earth a. began in the waterb. first evolved around 3,500 million years agoc. began as single-celled organismsd. a and be. all of the above

When the cell concentrates potassium within, against the natural tendency of matter, it is performing a.passive diffusion b.facilitated diffusion c.active transport d.pinocytosis

Why is a mushroom considered a heterotroph

Which of the following is an example of competition a. the leaves of a tree prevent a small shrub from getting sunlight. three species of birds feed a different heights in the same tree. b. three species of birds feed at different heights in the same tree c. zebra and giraffe’s feed on different grassland plants d. cats living in two different homes eat the same brand of cat food.