Which organ to pull air into the lungs by creating space and negative pressure in the lungs when it contracts?

the alveolus

the diaphragm

the bronchi

the glottis

This is one of the five kingdoms in the older biological succession. organisms in this kingdom are prokaryotic

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

Which of the following statements is most likely correct about a rock belonging to the jurassic age and a rock belonging to the cambrian age? options: 1) they have identical fossils of organisms that have evolved over time. 2) both have animal fossils preserved in them due to weathering and erosion. 3) they contain different fossils because life on earth has changed through time. 4) the fossils in them were formed on the surface of earth due to exposure to sunlight.