An organ system- A. Is a collection of organs that work together to perform a specifc job

B. Is a collection of random cells that do not work together

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

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.

Which of the following is the smallest unit that would contain a complete copy of the entire human genome? a) one human somatic cell b) one human chromosome c) all of the dna of one human d) one human gene