The heart is made mostly of

vascular tissue
nervous tissue
muscular tissue
connective tissue

Loss of protected health information collected for research should be directly reported to:

Which of the following statements about protists are true? a.they are typically found in moist environments. b.they are all unicellular. c.they have a nucleus. d.they are all multicellular.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.