Which two types of rna pair up using a codon-anticodon link?

mrna and rrna
trna and itself
trna and rrna
mrna and trna

Which statement accurately describes the rock layers? layer 8 is older than layer 1. layer 3 is younger than layer 6. layer 4 and layer 10 are the same relative age. layer 2 and layer 9 are the same relative age.

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey

Name the type of chemical that speeds up digestion