Biology, 12.01.2021 18:10 2020seogang
She enjoys studying fossils. She learned how fossils called index fossils are found in the rock layers. The index fossils help scientists study rock ages. In what way do index fossils help determine rock ages?
A. Index fossils are widely distributed but were not around long, and so they show up in only a few rock layers.
B. Index fossils are widely distributed and were around for a long time, and so they show up in many rock layers.
C. Index fossils were around only a short time but they show up in many rock layers.
D. Index fossils are widely distributed and are always found in every sedimentary rock layer.
Answers: 2
Biology, 22.06.2019 08:00
Choose the correct words to complete the sentences related to genetic screening. is a procedure that is used during pregnancy to detect genetic defects. is extracted from the uterus and used to identify genetic disorders?
Answers: 3
Biology, 22.06.2019 13:20
Which of the following determines the specificity of a dna probe? a. type of radiation b. level of enzymatic activity c. number of neutrons d. complementary base pairing
Answers: 1
Biology, 22.06.2019 15:30
The most effective way to provide children with safety messages is to
Answers: 3
She enjoys studying fossils. She learned how fossils called index fossils are found in the rock laye...
Health, 17.12.2019 07:31
Mathematics, 17.12.2019 07:31
English, 17.12.2019 07:31
Social Studies, 17.12.2019 07:31
English, 17.12.2019 07:31
English, 17.12.2019 07:31
Biology, 17.12.2019 07:31
Mathematics, 17.12.2019 07:31
Mathematics, 17.12.2019 07:31