What is key to preventing extinction of any one species?

What direction, in regards to concentration, does diffusion move particles across the membrane?

In pea plants, tall plants are dominant to dwarf plants. Two heterozygous plants are crossed. If they have 80 offspring, how many plants would be dwarf sized? How many would be tall?

1) The density of a substance is the ratio of its mass to its volume. The formula for density is: D = mass/volume. If the density and the volume of a liquid are known, its mass can be found by

What is the specific site of gas exchange in the respiratory system? what is the specific site of gas exchange in the respiratory system? bronchioles bronchi diaphragm alveoli?

Which phrase best describes DNA? A. the structure that transports copied information to the ribosomes B. the molecule from which RNA is produced C. the structure made of connected amino acids D.

Trace the path of filtrate and urine from the glomerulus to the external urethral opening

What is the endocrine portion of the pancreas called?

In which order will seismic waves from an earthquake arrive

Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? A. nitrogen + hydrogen peroxide → hydrazine + water B. nitrogen + water → hydrazine + hydrogen peroxide C.

Both frogs and ducks have webbed feet. However ducks are more closely related to perching birds than to frogs. Explain the process that has resulted in both frogs and ducks having feet that are similar