« previous next »

Author Question: Discuss why marine phytoplankton are generally smaller and more ornate than their freshwater ... (Read 304 times)

luminitza

  • Hero Member
  • *****
  • Posts: 555
on: Aug 22, 2018
Discuss why marine phytoplankton are generally smaller and more ornate than their freshwater counterparts.
 
  What will be an ideal response?

Question 2

Variations in Earth's orbit that influence long-term climate changes include ________.
 
  A) the shape of Earth's orbit (eccentricity)
  B) the tilt of Earth's axis of rotation (obliquity)
  C) the wobbling of Earth's axis of rotation (precession)
  D) eccentricity, obliquity and precession


Christopher

  • Sr. Member
  • ****
  • Posts: 316
Reply #1 on: Aug 22, 2018
Answer to Question 1

The photic zone is the upper portion of the ocean in which light levels are sufficient to support photosynthesis. In the open ocean, this layer is 100-200 meters deep. If autotrophic planktonic organisms sink below 200 meters, then they die. Marine diatoms are much smaller than freshwater diatoms; their increased surface area to volume ratio keeps them afloat. Additionally, marine diatoms have ornate spines that increase surface area. Many freshwater diatoms live in habitats where light penetrates to the bottom so sinking is not problematic. Freshwater diatoms lack the ornate spines frequently observed in marine diatoms because light penetrates to the bottom of the pond, stream, or puddle where they live.

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

luminitza

  • Hero Member
  • *****
  • Posts: 555
Reply #2 on: Aug 22, 2018
Both answers were spot on, thank you once again


Christopher

  • Sr. Member
  • ****
  • Posts: 316
Reply #3 on: Aug 22, 2018
Great! Please up vote :D


« previous next »
 

Did you know?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

Did you know?

When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

Did you know?

People often find it difficult to accept the idea that bacteria can be beneficial and improve health. Lactic acid bacteria are good, and when eaten, these bacteria improve health and increase longevity. These bacteria included in foods such as yogurt.

Did you know?

Medication errors are more common among seriously ill patients than with those with minor conditions.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

Map distances are generally additive Map distances are generally additive
Eggs of Potamon fluviatile, a freshwater crab Eggs of Potamon fluviatile, a freshwater crab
Uses of Freshwater Uses of Freshwater
Children with autism generally prefer interacting with objects over people. Children with autism generally prefer interacting with objects over people.
Organic-rich marine clays Organic-rich marine clays
Fluid–solute balance in freshwater and marine bony fishes Fluid–solute balance in freshwater and marine bony fishes
Video: The life cycle of protein

For a complete list of videos, visit our video library