1. the earth's carbon cycle consists of the flow, cycling, and recycling of all of the carbon on the earth. every living organism's composition includes the element carbon. how does carbon become part of living organisms?

Which of the following lines of evidence would best support your assertion that a particular plant is an angiosperm? a) it produces seeds. b) it retains its fertilized egg within its archaegonium. c) it lacks gametangia. d) it undergoes alternation of generations.

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.

What controls activities within a eukaryotic cell?