Looking at the geologic timeline, what is the pattern that scientists use to determine when an ERA begins and ends? Group of answer choices Scientists have divided the eras into large, equal intervals of time. An era begins every time a new species emerges in the fossil record. Scientist use the emergence and extinction of species.

Type the correct answer in the box. use numerals instead of words. fiona has a lovely flower bed in her yard. she wants to add a fence along one side of the flower bed. the fence material is sold in meters. fiona knows that her flower bed is 200 centimeters in length. how much fencing material does fiona need in meters? fiona needs meters of fencing material for her flower bed.

Vessels draining the myocardium of the heart, open primarily ,into which chamber?

Ascientist is designing an investigation to study the impact of invasive bird populations on local, native bird populations at backyard bird feeders. what population is most likely to be a control group for the investigation? amount of food number of bird feeders invasive bird populations local backyard birdfeeders without food