If a scientist wants to figure out how old a rock layer is, would it be useful to use a substance that takes a long time to break down (has a long half life), or a substance that breaks down quickly? is it A. A substance that breaks down slowly, because then there won't be enough left to measure

B. A substance that breaks down slowly, because then there will be enough left to measure.

C. A substance that breaks down quickly, so it will be all gone and we'll know it's old

Select all the correct answers. lactobacillus is a bacteria that live inside humans. these bacteria live on the nutrients from our bodies. they to keep our gut clean and healthy. s. typhi is a bacteria that enter our bodies through contaminated food. this bacteria causes infections in the body. based on this information, which two statements about the association between these bacteria and humans are true? a. lactobacillus shares a parasitic relationship with humans. b. s .typhi shares a parasitic relationship with humans. c. both lactobacillus and s. typhi share a parasitic relationship with humans. d. both lactobacillus and s. typhi share a mutualistic relationship with humans. e. lactobacillus shares a mutualistic relationship with humans, and s. typhi shares a parasitic relationship multiply chrse

What is earths lithospheric plates interact at

The mammal pictured below is a silvery mole rat. which statement is an inference based on the picture? the animal is ugly. the animal has hairless feet with sharp claws. the animal has prominent upper and lower incisor teeth. the animal likely has poor vision since its eyes are so small.