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What is the acceleration due to gravity at the space station.

Overview of types of immune responses. Difference between innate and adaptive immunity. Differences between humoral adaptive immunity and cell-mediated adaptive immunity.

Understanding the structure of a muscle cell

DNA is made up of two strands. Each strand has a backbone made up of alternating sugars and phosphate groups. The two strands are linked by complementary nitrogenous bases. The strands are oriented in opposite directions, making the structure "antiparallel".

Binary fission, budding, mitosis, fragmentation, parthenogenesis and sexual reproduction.

These three short online lessons discuss asteroids, comets and meteors.

Solving a word problem to find average velocity and speed of an object in one-dimension.

Introduction to bacteria

Patterns and processes of evolution. How evolution and natural selection are reflected in the similarities and differences of organisms. 

Breaking down photosynthesis into light dependent reactions and Calvin cycle..