Which image would best support a reader's understanding of the text? Before a star is a star, it is an enormous cloud of gases. At the start, wisps of gas and drifts of dust collect, their gravity drawing them together. As more stuff gathers, its combined gravitation grows stronger.

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.

The polio virus can cause skeletal muscle paralysis by destroying neuron cell bodies. what area of the spinal cord is destroyed

What happens when two nitrogen atoms share electrons