What is the purpose of controlling the environment when testing a hypothesis?
it allows the scientist to determine the effect of the changed variable.
it allows samples and organisms to be tested under comfortable conditions.
it makes it easier for the scientist to perform the steps of the experiment.
it ensures that the scientist is undisturbed while performing the experiment.

Which flexible structure that supports the nerve cord and led to the backbone

Match each description to the appropriate biome. tropical savanna desert tropical rain forest taiga tundra has sparse vegetation and very cold temperatures located near the equator and contains trees that form dense canopy layers is very hot and dry, and has plants that need little water has cold winters, heavy snowfall and is dominated by conifers has warm temperatures and is dominated by grasses

The production of cells during mitosis into specialized function is recombination or differentiation