This element is solid, forms the backbone of many compounds, and life is based on it. what is it?

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

Using meiosis, the sporophyte produces spores that are .

Which is a function of vascular tissue? a. to perform photosynthesis b. to transport water and nutrients c. to absorb minerals and sugar d. to interact with soil fungi