What is considered as "controlled variables" in hydroponics

Whistling is considered bad luck among mariners because it challenges the wind. Where did this idea most likely come from? Science Mathematics Biology Pseudoscience

Which gas is a source of natural groundwater pollution im thinking its carbon

Each cerebral hemisphere can be roughly divided into four lobes. which lobe processes auditory information?

Which of the following statements describes a proton of an atom? A. has a positive charge and is located in the nucleus B. has a negative charge and is located in the nucleus. C. has no charge and is located in the nucleus D.

What three factors contribute to the layering effect that occurs in the world's oceans? I know one of them is salinity

The opening and closing of the heart valves is caused by action potentials within the cusps of the valves. contraction of the smooth muscle in the walls of the great vessels leaving the heart.

What is systematics and why is it a less arbitrary and more natural approach to categorizing living organisms?

Think about the following items: a candle flame, a balloon floating in the air, and bubbles blown from a bubble wand. Describe characteristics that could indicate life in these items, and characteristics that show they are not alive.

If a person wanted their child to have 6 fingers on each hand, explain how you think a doctor would be able to accomplish this

Why are you less likely to find fossils in metamorphic rocks?