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

Author Question: Today, there are over 270,000 plant species with conductive tissues and material flow systems known ... (Read 37 times)

kaid0807

  • Hero Member
  • *****
  • Posts: 515
on: Jul 14, 2018
Today, there are over 270,000 plant species with conductive tissues and material flow systems known as
 
  A) vascular plants. B) xeriphytes. C) blue-green algae. D) cyanobacteria.

Question 2

The gaseous oxygen in Earth's early atmosphere was a by-product of
 
  A) photosynthesis.
  B) photochemical reactions breaking down ozone (O3 ) to form oxygen (O2 ).
  C) volcanic outgassing.
  D) decay of organic matter.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Jevvish

  • Sr. Member
  • ****
  • Posts: 326
Reply #1 on: Jul 14, 2018
Answer to Question 1

A

Answer to Question 2

A


kaid0807

  • Hero Member
  • *****
  • Posts: 515
Reply #2 on: Jul 14, 2018
Thank you :)


Jevvish

  • Sr. Member
  • ****
  • Posts: 326
Reply #3 on: Jul 14, 2018
Happy to help you


« previous next »
 

Did you know?

Cyanide works by making the human body unable to use oxygen.

Did you know?

A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.

Did you know?

The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

Did you know?

Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

Did you know?

GI conditions that will keep you out of the U.S. armed services include ulcers, varices, fistulas, esophagitis, gastritis, congenital abnormalities, inflammatory bowel disease, enteritis, colitis, proctitis, duodenal diverticula, malabsorption syndromes, hepatitis, cirrhosis, cysts, abscesses, pancreatitis, polyps, certain hemorrhoids, splenomegaly, hernias, recent abdominal surgery, GI bypass or stomach stapling, and artificial GI openings.

Relationships between direction of flow of blood and water or air in different vertebrates. Relationships between direction of flow of blood and water or air in different vertebrates.
Heart Flow Heart Flow
Plant Plant
Flow Aloft and Cyclone Formation Flow Aloft and Cyclone Formation
Flow data for a healthy donor (top panel) and a HIV positive patient. CD3 is a T-cell marker, CD4 is ... Flow data for a healthy donor (top panel) and a HIV positive patient. CD3 is a T-cell marker, CD4 is ...
Sympathetic division—innervation to most effector tissues & Parasympathetic division Sympathetic division—innervation to most effector tissues & Parasympathetic division
Video: How Hemoglobin Picks Up and Delivers Oxygen

For a complete list of videos, visit our video library