I think plants in tundra lack vascular systems (xylem and phloem) because only simple (nonvascular) plants grow in tundra.
Hope this helps
Answer:
Angle of light source
Explanation:
Independent variable is the variable that the experimenter changes or manipulates in an experiment in order to bring about a measurable response, which is the dependent variable.
In this question, a student wants to investigate the effects of phototropism in bean plants. She places a light source directly above one plant, at a forty-five degree angle to another, and at a ninety-degree angle from the third. This shows that the variable being manipulated (independent variable) is the ANGLE OF THE LIGHT SOURCE.
The red blood cell will be more exposed to oxygen making it a lighter color. ur veins r full of dark red blood and white blood cells (which are donut shaped)
Deoxyribose sugar and phosphate group
Are nucleotides
The right answer is a. they contain many small, repeating subunits bonded together.
In chemistry and biology, a polymer is a molecule made up of a chain of similar molecules, called monomers; a polymer is a macromolecule resulting from the assembly of many identical units (monomers), a chemical compound with repetitive structural units.
DNA, glycogen and proteins are polymers
