Choose all that what does the cardiovascular system do? a. carries hormones for the endocrine system b. transports oxygen and carbon dioxide for the respiratory system c. sends nerve impulses to the brain and spinal cord d. carries nutrients for the digestive system e. works with the immune system to fight infection

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.

Skulls of homo sapiens were found during an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are ( 1 ) fossils. ( 1 ) a. mineralized b. mold c. original-tissue