> > why are scientists who are searching for life on other planets studying archaebacteria?

they live in conditions similar to those likely to be found on other planets.

they are similar to the organisms found on other planets.

they are rare and likely to be abundant on other planets.

they are the easiest cells to study without using a microscope.

What was the land like over 500 million years ago? what was under the sea?

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation

What is the significance of the protein-lined pits? a. protein attracts other proteins needed for atp synthesis within the cell. b. protein-lined pits are able to transport one molecule at a time down the concentration gradient within the cell. c. the polarity of proteins allows other polar molecules to attach and be transported in the cell by transport channels. d. receptors within the pits allow ligands to fuse and be transported into the cell by endocytosis.