PLEASE HELP! The purpose of the serous fluid in the pericardial cavity is

A) to carry critical nutrients like oxygen to the heart

B) do you provide CA2= to ions needed for muscle contractions

C) decrease friction between the layers of the heart as contractions

D) to lubricate the walls of the blood vessels to decrease resistance to blood flow

Which of the following statements most accurately describes convergent evolution? the process in which two similar species evolve separately from each other and share similar characteristics the process in which a single species evolves into two or more new species the process in which two entirely different species evolve in response to each other the process in which two different species evolve separately from each other but still share similar characteristics

Explain the significance of the increased cell specialization of the volvocine line

16. which of the following accurately describes a step within transcription? a. dna polymerase uses one strand of rna as a template to put together nucleotides. b. the dna strand is used as a template for which a complementary rna strand can be produced. c. the rna strand forms a template by which dna can be built. d. the rna strand is produced within the cytoplasm.