Ships that use ballast water are not in danger of introducing invasive species into aquatic habitats.
true
false

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

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?