Which of these acts perpendicular to each other to produce an electromagnetic wave? • changing crests & troughs
• changing electric & magnetic fields
• changing compression & energy transfer
• changing longitudinal & transverse waves

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

In a cladogram' when does a group of organisms branch off

Recombinant dna (rdna) creates offspring which are genetically identical to the parent is the process of breeding only organisms with desirable traits involves the removal of the nucleus of a cell combines genes from organisms of different species in a lab