• 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
51.7K
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.
 313
Root Hairs
 29185
The bronchial tree
 751
Enceladus
 404
Anatomy of a eudicot leaf
 382
Main components of the human endocrine system and the effects of their secretions
 444
Side view of a jumping spider making a leap
 217
Red Algae
 4357
Changes in metabolic rate of selected structures in a mammal's body during different activities
 236
Volvox
 263
Genetically Modified Pig
 325
Flowering plant life cycle
 297
A marine flatworm
 440
Number of cells in the brain
 12
Alcohol metabolism
 315
Ciliate Structure: Paramecium
 348
Tree Rings: Pine
 329
Spore Bearing Structures of Pilobolus
 215
Morphological divergence among vertebrate forelimbs
 307
Diversity of Hawaiian Honeycreepers
 264
Eucalyptus robusta
 8712
Stages of transcription
 342
Relaxed and supercoiled DNA molecules
 342
Action Potential Summary
 219
Characteristics of Some Protist Groups
 6843
Body plan of an echinoderm, as represented by a sea star.
 168
DNA Sequencing
 81
The Thylakoid Membrane
 197
Interphase in Plant and Animal Cells
 385
Exogenous Antigen Processing
 394
Pollen on stigmata - mallow (Malva neglecta)
 334
The compound eye of a deerfly
 1142
Top down view of Olympus Mons, the highest known mountain in the solar system
 331
Adaptive Immunity
 653
Spider (tarantula)
 1372
Getting Connected
 530
Primary growth in a root
 4730
Major structures of the human brain.
 692
Water-conserving structures in a transverse section of pincushion leaf (Hakea laurina)
 323
Valves in veins prevent the backflow of blood
 332
Embryonic development of shepherd’s purse (Capsella), a eudicot
 313
Amniote Eggs: Snakes
 806
All human organ systems and their functions (Part 1)
 300
Roundworm Body Plan
 17081
Diagram of the life cycle of Plasmodium falciparum, the causative agent of malaria
 343
Coelacanth
 249
High in the Andes, a scientist measures the stride of a carnivorous dinosaur
 317
Tadpole
 440
Sir Isaac Newton
 295
An Ediacaran Fossil
 471
Bug depositing fertilized eggs on a pine needle
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!
Calculating the Equivalent Value at a Later Date (Simple Interest)
Calculating Simple Interest on a Variable Rate Loan
Cost-Volume-Profit Analysis
Straight, Variable, and Gradual Commission Calculations
Using the Modified Offset Method to Find the Area of Irregular Shapes
Differential Pay Schedule vs. Straight Piece Rate Pay Calculations
Inflation-Adjusted Annuity Calculation (Increasing Annuities)
Deriving the Present Value of Annuity Formula
Alcohol Content of a Shot Compared to a Beer
Volume of a Frustum (Formula Derivation)
Calculating the Interest Rate in an Annuity (Using Excel)
Handling Partial Periods with Drop and Balloon Payments #finance #annuities
Future Value of Compound Interest Formula (How it Works and its Derivation)
Solving for the Number of Periods in an Annuity
Grade 6 Math Challenge: Average Speed 95% Get This Wrong!
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.
How is ten-year-old Natasha most likely to describe herself?
A) "a good gymnast"
B) "good at drawing"
C) "friendly"
D) "short"
Quiz Me
Increased emphasis on high-stakes testing in schools has impacted students and teachers in all but which of the following ways?
 
  a. Off-task behavior has increased because students are bored with the material.
  b....
Quiz Me
The nonactivists who opposed the recent fiscal stimulus package argue that
A) fiscal stimulus might kick in after the economy had already recovered.
B) fiscal stimulus would take too long to work because of long implementation lags.
Quiz Me
Mr. Marks teaches his students to shoot free throws by teaching them how to stand correctly. When they can do that, he teaches them how to hold the ball to prepare for the shot. When they can do those two steps, he teaches them how to shoot the ball....
Quiz Me
Neighborhood resources __________.
A) play little or no role in children’s development 
B) have a greater impact on adults than on children and youths
C) are not important in late adulthood because most elders are homebound
Quiz Me
The average labor time to sew a pair of denim jeans is 4.2 hours with a standard deviation of 30 minutes. If the distribution is normal, then the probability of a worker finishing a pair of jeans in less than 3.5 hours is:
 a. 0.0808.
Quiz Me
Technician A says that silent chains are quieter than roller chains and do not stretch with use. Technician B says that on overhead valve engines, the camshaft is usually placed in the block above the crankshaft. Who is right?
A) Technician...
Quiz Me
A river flows toward the east at 1.7 m/s. Steve can swim 2.0 m/s in still water. If he swims relative to the water at a direction of 33 degrees west of north, how long will it take him to cross the 75 m wide river?

▸ 45...
Quiz Me
Which of the following is not related to the expansion of family therapy research in the 1990s?
 
  a. increased funding by the National Institute of Mental Health
  b. increased funding by the National Institute of...
Quiz Me
What would be the best way to help a student who reads tape as tap and ate as at in a story?
 
  a. Teach or review short-vowel patterns and provide extra practice with short vowels.
   b. Teach or review...
Quiz Me
What specific cultural belief may contribute to men experiencing Koro in certain cultures?
 
  A) The fear that one's genitals are being consumed by negative energy
  B) The feared loss of male energy
  C) The...
Quiz Me
Three-month-old Mikey is beginning to communicate through __________, whereas his six-month-old cousin, Charlie, is __________.

▸ cooing; babbling

▸ babbling; cooing

▸ vocalizing; cooing

▸ babbling;...
Quiz Me
We're Social
Follow us on your favorite social media platform