Arrange these structures in order of lower level of organization to upper level and write the level against each structure. neuron , nervous system , electron , man , mass of neuron , carbon , mitochondria , brain , protein

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area