Why are valves present in veins but not in arteries?

What increases plant growth

When did electricity come to rural farms?

Which of these. Has a nucleus coma and tail A comets B stars C asteroids D meteors

Archaea are different from Bacteria in that Archaea A. have structures and molecules that are more similar to eukaryotes than bacteria. B. have structures that are more similar to bacterial structures. C.

Which is the most accurate representation of the organization levels of the genetic information in cells? a. genome - -> genes - -> nucleotides - -> chromosomes b. genes - -> nucleotide - -> chromosomes - -> genome c.

Rubbing the balloons against the woolen fabric or your hair creates static electricity. This involves negatively charged particles (electrons) jumping to positively charged objects.

Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle? A) gamma aminobutyric acid B) acetylcholine C) cholinesterase D) norepinephrine

How does gas like oxygen get across the cell membrane?

Why are there so few aquatic plants and phytoplankton that live at the bottom zones in the ocean? a. the ocean floor contains many de composers b. most sunlight is absorbed before reaching these levels c. water is limiting factor d.

Which of the following is not a property of a base? Feels slippery to the touch Changes red litmus to blue Has a sour taste Produces OH - ions