How can astronomers tell what a distant object's velocity is?
a by measuring the redshift or blueshift of the object
b by looking for particular lines in its spectrum
c by the frequency of the electromagnetic radiation it gives off
d by timing how long it takes light to reach the object and return

it is a

Indica el nombre y la fucion de los vasos sanguineos que entran y salen de los riñones

What are tissues? a groups of tissues that work together b basic units of structure and function c groups of cells that perform the same function d multiple organs that perform a major function

Pls need ! in your opinion, what are the limiting factors that might affect the growth or diversity of our ecosystem? respond to this question in claim, evidence, reasoning format. 1. make your claim (i are the limiting factors that might affect the growth or diversity of our 2. follow the claim with 3 pieces of evidence. evidence may be taken from the reading, the videos, previous lessons, or googled answers. site sources, too. 3. use reasoning to explain why you chose your evidence.