10.If urea (46 - 0 - 0) cost $480.00 per ton and ammonium sulfate (21 - 0 - 0) cost $265.00 per ton , which fertilizer would be the most economical source of nitrogen ? Explain .

Imagine that a mouse has white fur because of a mutation in its dna. which of the following conclusions can be drawn

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

Living cells cannot use heat to provide the activation energy for biochemical reactions because which choice(s) complete the sentence correctly? a) answer choice ii. eliminate b) answer choices ii and iv. c) answer choice iii and iv. d) all answers can complete the sentence.