Butterflies obtain nectar, a food source, from flowers. When they fly from one flower to another, they disperse pollen. Which type of interaction do the butterflies and flowers have?

An increase in the calcium ion level in the sarcoplasm starts the sliding of the thin filaments. when the level of calcium ions declines, sliding stops. a. True b. False

Suppose we discovered a form of life like our own which utilized 20 amino acids, but had 6 nitrogeneous bases instead of the 4 our life uses. what would be the minimum length of a codon which could represent all 20 currently used amino acids?

Why do your stomach and intestines need a greater supply of blood when they are digesting food?

Which of the following is not a possible cause for air pollution? a. volcanoes b. industry c. combustion d. none of the above

Lilies have flower parts in multiples of three and vascular bundles scattered throughout their stems. corn plants have fibrous roots and leaves with parallel veins. roses have tap roots and two cotyledons.

During an experiment, the same type of bacteria is grown in two petri dishes. Petri dish A has a diameter of 51 mm and has approximately 40,000 bacteria after 1 hour.

In which phase of the cell cycle are cells most often found?

Which is true about metals used for jewelry such as platinum and gold

Wetlands and estuaries are critical ecosystems, but do not require protection. T F

How is the scientific hypothesis different from a scientific theory?