Which of the followings are correct?單選或多選:a. Land plants absorb essential elements, both macronutrients and micronutrients, from soil. Therefore, plants can only grow in soil.b. Fungal filaments around the roots, help plants to absorb water and minerals much more rapidly than roots only.c. Fungi in mycorrhiza and nitrogen-fixing bacteria in root nodules of legumes have mutually beneficial symbiotic relationship with plants.d. All macronutrients have to dissolved in water for plants to absorb.e. Nitrogen in the air must be converted to ammonium, by nitrogen-fixing bacteria, for plants to use.