Which evidence supports the claim that Earth’s continents formed during Precambrian time? Compaction caused rock to cool and rise to form pieces of crust.
Earth collided with a large object and threw material onto Earth’s surface.
Collisions with comets added land masses to Earth’s surface.
Earth’s surface cooled, causing rocks to cool and harden.

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2