The first organisms evolved on earth around 4 billion years ago. the fossil record indicates that the first organisms were which of the following? a. plastids b. prokaryotes c. mitochondria d. eukaryotes

Hedgerows have created a new ecosystem within britain’s a. farms b. cities c. forests d. industrial areas

Hemoglobin is a proton that carries oxygen around your body what is hemoglobin made from

Select the correct answer. which statement applies only to the axial skeleton, not the appendicular skeleton? a. it contains a pivot joint. b. it has muscles attached that work in pairs. c. it contains red bone marrow. d. it possesses fossa for bone articulation. e. it protects the heart and lungs.