Over a million students use our free study notes to help them with their homework
A population of one species is separated by a physical barrier, e.g a geographical barrier such as the movement of tectonic plates. There will then be 2 isolated groups of the same species unable to inter...
Plant cells have chloroplasts, a vacuole and a cell wall.
Nucleus, mitochondria, ribosome, cytoplasm, cell membrane.
Vaccination is an important method used in healthcare to prevent people from getting certain diseases. Vaccines contain a dead or weakened (attenuated) form of a pathogen, and the immune system res...
←
376
377
378
379
380
→
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