Amagnetic force cannot be created in an electromagnet without which of the folllowing ? a. an electric current b. a magnetic field c. an electric force d. an magnetic force

Which statement best explains how cellular respiration maintain homeostasis in animals? it maintains body temperature by absorbing energy. it breaks glucose into energy required by the organism. it speeds up metabolism by making oxygen. it produces energy from hormones present in the organism.

Which of the following is a cause of a dna mutation? o a. the linking of amino acid subunits into a long chain o b. the transcription of dna into rna o c. an error in the repair of damaged dna d. the diffusion of molecules across the cell membrane submit

How many trophic levels are there in the following food chain? phytoplankton - shrimp - perch - pike - osprey