Plants are classified as because they use for their carbon source. question options: a. autotrophs; co2 b. heterotrophs; co2 c. phototrophs; co2 d. heterotrophs; glucose e. autotrophs; glucose

The image shows embryos of three vertebrate classes

Identify the type of energy used in each action. the flexing of an arm muscle: a signal transduction process by a neuron: a ball at the top of a hill: 1. electrical energy 2. mechanical energy 3. gravitational potential energy

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.