• Your 24/7 Study Community
    Let our members and experts help you today.
    Ask a question on your homework, textbook problem or any subject topic.
    Answer other members' questions for self-practice, posting credits, and goodwill.
  • Learn more...  What type of user are you?
    High School Student College Student Parent Educator Subject Enthusiast
  • Ace Your Classes
    with the help of Biology Forums' online study community...
    ...where you can find real help from students, educators, and subject enthusiasts.
    It's free!
    Join Today
Who Are We?
Biology Forums - Study Force is a global community comprised of students, educators, and enthusiasts helping each other understand how to solve problems in sciences, mathematics, business, nursing, humanities, and many more subjects.
Q and A Experts
Gallery
Study Resources
Dictionary
We provide access to various types of study material, including textbook solutions, topic notes, sample problems, illustrations, and practice exams that are created by us, indexed from the web, or contributed by our members.
Blogs
Video Tutorials
Flashcards
Textbook Solutions
Our tools, content, and community empower students to push the limits of their learning capabilities.
4.8M
Total Posts
1.9M
Total Topics
27.6K
Members Registered this Year
0
Guests Browsing
0
Members Online
0
Registrations Today
From Our Gallery
Enhance your visual learning  Download and share pictures with your free membership.
What better way to learn than with access to over 35,000 diagrams, photos, and illustrations.
 494
The cascade of events by which the stroke-induced release of glutamate kills neurons.
 4478
Changes in metabolic rate of selected structures in a mammal's body during different activities
 4786
A closer look at the reproductive cycle of human immunodeficiency virus (HIV)
 474
Synaptic Density
 1481
Tissue Repair, Aging, and Disorders
 148
Electromagnetic Spectrum of Radiant Energy
 587
Paramecium
 3106
Eye Anatomy of a dog
 4853
Variation in shape and length of nerve cells.
 5260
Toucan uses beak to keep it cool
 6983
Body plan of an echinoderm, as represented by a sea star.
 510
The large, white flowers of giant saguaro cactus (Carnegiea gigantea) produce sweet nectar. The flow
 419
An 8-week-old fetus
 9520
Thrombus formation in an atherosclerotic vessel
 597
Complete Lifecycle of a Frog
 316
Alfred Wallace
 440
Roundworm Body Plan
 322
Sketch of Euglena gracilis
 409
The genetic code
 449
Mammalian Teeth
 605
China has relied on cheap coal to meet its demand for energy
 539
Turtle Skelton
 307
Loxioides bailleui
 440
Primate skin
 20
Exposure pathways
 510
Main components of the human endocrine system and the effects of their secretions
 299
Daphnia pulex
 410
Metabolic receptors
 16
Disorders and conditions that can be caused or aggravated by stress
 405
The last captive quagga
 364
Structure of polypeptide chains
 458
Life cycle of the beef tapeworm (Taenia saginata).
 1043
Solar Eclipse
 1430
Balloon angioplasty
 16099
The ovarian and uterine cycles in a human female.
 12070
Hormonal control of parturition.
 456
Evolution of hominids
 556
A bird's skeleton
 418
American Toad
 815
Cross-section of a human molar
 528
Nonanthropoid Primates: Lemur
 481
Life cycle of Obelia, a hydrazoan that has alternating medusa (left) and polyp generations
 294
Checkpoint Genes in Action
 797
Cohesion–tension theory of water transport in vascular plants
 535
Anatomy of a eudicot leaf
 4116
Mosquito Larva and Parasite
 592
A sea star
 438
Salt grains up close
 361
High in the Andes, a scientist measures the stride of a carnivorous dinosaur
 592
Autonomic nerves and their effects
Our Videos are Simple, Yet Effective
Skip the theory  The best way to learn is by watching tons of video examples.
Get right to answering questions with step-by-step explanations in HD quality!
Diffie-Hellman Key Exchange Protocol (Step-by-Step) #cryptography
Reading a Tape Measure #trades
Solving a System of Linear Equations Graphically
Basic math - Long division with decimal numbers
Solve Basic Percent Change Problems
Solve Basic Percent Proportion Problems (Using BR = P)
Converting Between Fractions and Percentages with Repeating Decimals #basicmath #fractions
Solving Proportions by Cross-Multiplication #equations #fractions
Finding the Generators of Z*_7 #numbertheory #grouptheory
Merkle-Hellman Knapsack Algorithm Part 2: Encryption and Decryption #cryptography #algorithm
Merkle-Hellman Knapsack Algorithm Part 1: Generating the Public Key #cryptography #algorithm
Internal Rate of Return (IRR) Calculation #finance #investments
Finding the Modular Inverse #numbertheory
Calculating the Net Present Value (NPV) #finance #investments
Greedy Algorithm Example
Online Flashcards
Study, learn, and test youself  Whether you want to memorize every bone in the body or prepare for the upcoming MCAT, our web-based flashcard maker has you covered.
What are the two main types of general-purpose sealers?
Quiz Me
The sixth graders in Mrs. Marsh's class are well aware of the rules and procedures that were established the first week of school. Now, in the fifth week of school, Mrs. Marsh expects students to comply and cooperate with minimal correction....
Quiz Me
A buildup of yellow ________ inside the engine results from the oxidation of oil.

▸ sludge

▸ *
Quiz Me
An electric cooling fan assembly and radiator cannot be removed together.

▸ true

▸ false
Quiz Me
What's the correct obverse of "All donuts are cookies"?

▸ Some cookies are donuts.

▸ All donuts are non-cookies.

▸ No donuts are non-cookies.
Quiz Me
Calculate the accumulated value of $3000.00 at 8% compounded quarterly for fifteen years. How much of the amount is interest?
Quiz Me
A researcher establishes a new test of intelligence and establishes the test norms by administering the test to students at the university where he works. Other researchers and clinicians begin using the new test to measure intelligence in a variety...
Quiz Me
In which order should cylinder head bolts be removed?

▸ Starting with the shortest, then longest

▸ Starting with the longest, then the shortest

▸ Starting at the outside and working inward

▸...
Quiz Me
A very thin uniform rod, 2.40 m long and of weight 135 N, has a frictionless hinge at its lower end. It starts out vertically from rest and falls, pivoting about the hinge. Just as it has rotated through an angle of 55.0°, what is the downward...
Quiz Me
What must be observed when installing the timing belt or timing chain?

▸ Number 1 piston must be at BDC.

▸ This must be done before the cylinder head is installed.

▸ The alignment of the crankshaft in relation...
Quiz Me
An adaptive lighting system performs a self-test by ________ the headlights.
 
  A) Moving the lights up and down B) Moving the lights left and right
  C) Both A and B D) Neither A nor B
Quiz Me
The water temperature of a nonsterile vaginal douche should be
 A) 90 degrees F.
  B) 95 degrees F.
  C) 105 degrees F.
  D) 120 degrees F.
Quiz Me
We're Social
Follow us on your favorite social media platform