Over a million students use our free study notes to help them with their homework
For IB Biology, there are three types of evidence for evolution you need to know: fossils, selective breeding and homologous structures.
Fossils are preserved remains or traces of organisms from th...
The hormone auxin causes cells in shoots to grow faster, and cells in roots to grow more slowly. Auxin becomes more concentrated on the side of the plant that is not facing the light, the shaded side. In ...
In the cells lining the proximal convoluted tubule, sodium-potassium pumps present in the membrane in contact with tissue fluid pump sodium ions out of the cells. This lowers the concentration of sodium i...
By definition, diffusion is the movement of particles from a region of high concentration to a region of low concentration. It occurs in liquids and gases where particles can move freely down a concentrat...
A protein is a sequence of many amino acids. All proteins are made of amino acids. Humans have 20 distinguished amino acids that can arrange in thousands of different combinations and this means that they...
←
784
785
786
787
788
→
Internet Safety
Payment Security
Cyber
Essentials
Comprehensive K-12 personalized learning
Immersive learning for 25 languages
Trusted tutors for 300 subjects
35,000 worksheets, games, and lesson plans
Adaptive learning for English vocabulary
Fast and accurate language certification
Essential reference for synonyms and antonyms
Comprehensive resource for word definitions and usage
Spanish-English dictionary, translator, and learning resources
French-English dictionary, translator, and learning
Diccionario ingles-espanol, traductor y sitio de apremdizaje
Fun educational games for kids
