This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Microscopic crystals of silica form a hard rock called chert, which can be shaped to form sharp ... (Read 175 times)

j.rubin

  • Hero Member
  • *****
  • Posts: 557
on: Jul 13, 2018
Microscopic crystals of silica form a hard rock called chert, which can be shaped to form sharp cutting edges.
  Indicate whether the statement is true or false

Question 2

Fossil evidence suggests that such land-dwelling arthropods as _____ had evolved by at least the Devonian.
 A)trilobites
 B)molluscs
 C)scorpions
 D)beetles
 E)spiders


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ergserg

  • Sr. Member
  • ****
  • Posts: 338
Reply #1 on: Jul 13, 2018
Answer to Question 1

True

Answer to Question 2

C


j.rubin

  • Member
  • Posts: 557
Reply 2 on: Jul 13, 2018
Great answer, keep it coming :)

Animal_Goddess

  • Member
  • Posts: 339
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

Did you know?

Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.

Did you know?

Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Did you know?

There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

This engraving of the Boston Massacre (1770) became the most reprinted depiction of the event, and p This engraving of the Boston Massacre (1770) became the most reprinted depiction of the event, and p
Instructions for Completing the CMS-1500 (02/12) Claim Form Continued Instructions for Completing the CMS-1500 (02/12) Claim Form Continued
Detonation is a secondary ignition of the air–fuel mixture. It is also called spark knock or ... Detonation is a secondary ignition of the air–fuel mixture. It is also called spark knock or ...
How to analyze transformations of a quadratic equation that is in vertex form How to analyze transformations of a quadratic equation that is in vertex form
Ferns disperse by releasing spores that form on the underside of leaves. Ferns disperse by releasing spores that form on the underside of leaves.
Video: ETC Protein Complexes & Chemiosmosis (Total ATP Production and ATP Synthase)

For a complete list of videos, visit our video library