Robert decides to go for a run when he gets home from school. as he begins running, his breathing rate starts to increase. what are the mechanisms that cause his breathing rate to increase?

Where in the cell are ribosomes made?

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.

20 how are energy cycles and growth cycles related?