Which of the following is required in order for homeostasis to be maintained? Select one:

An organism should be able to move to a new environment when conditions change.

There should be a constant input of stimuli to receptors so that internal conditions remain constant.

An organism should have an internal environment that differs from its external environment.

Passage of materials across cell membranes need to occur at a continuously rapid rate.

What was dr. willem johan kolff’s first step in using the scientific process to invent the hemodialysis machine? he built the machine and tried it with various patients, collecting data about its effectiveness. when a patient’s kidneys failed, he wondered if it would be possible to perform kidney functions with an external machine. he researched and collected data about numerous patients who exhibited symptoms of kidney failure. he drew conclusions from studies of various symptoms of kidney failure, and drew a design for the ideal external blood-processing machine.

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

If a strand of dna has 35% thymine. what is the percentage of cytosine, adenine, guanine?