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 39 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?

Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

Did you know?

Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

Did you know?

In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

Did you know?

Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

Did you know?

Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

An overview of plant signal transduction. An overview of plant signal transduction.
Plant Plant
Change in air temperature at various air flow rates for a 4 pass operation Change in air temperature at various air flow rates for a 4 pass operation
In plant fossils, leaf margin is used to estimate mean annual temperature In plant fossils, leaf margin is used to estimate mean annual temperature
diagram of a plant diagram of a plant
Video: Epidural Hematoma

For a complete list of videos, visit our video library