Which factors improve soil fertility? select the three correct answers.
a. horizons
b. bacteria
c. earthworms
d. humus
e. high ph

The many volcanoes located along the edge of the pacific ocean make up the ring of fire. how does subduction play a role in the volcanic activity in the ring of fire?

Idont understand by supporting the plant and holding the leaves up to the light. question 3 options: tap or fibrous root flower petals herbaceous or wood stems leaves with stomata

Explain two reasons you think it is important for scientists to search for new ways to treat cancer