A sample originally contained 1. 28 g of a radioisotope. It now contains 1. 12 g of its daughter isotope. How many half-lives have passed since the sample originally formed? 3 4 8 16.

Sand spinifex grass is adapted to growing on sand dunes. it is a rapidly spreading plant and the creeping runners produce new root systems. which of these best explains the benefits of these features? a. it limits water loss through the leaves. b. it provides support by anchoring the plant. c. it protects the plant from predators. d. it allows the plant to tolerate salt. reset submit

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution