Blood is moved through the vascular system by

A. valves in the wall of the blood vessels.

B. peristalsis caused by smooth muscle in the blood vessel walls.

C. pressure gradients created by the heart.

D. osmotic pressure.

E viscosity of the blood

You are a research scientist. You are growing body parts and organs in the lab. First you grew some simple body parts like ears and noses. Then you tried bladders and blood vessels.

How do unmodified cells become modified and specialized to red blood cells

Stacy bought two vegetables. One of them is scaly with a few buds and the other has hairy structures. Which parts of the vegetable plants did she buy? A. both are tuberous roots B. root and stem, respectively C. tuberous stem and root, respectively

Which of the following are pioneer species in primary succession?

Nursing has evolved throughout the ages. nurses in the 21st century face a variety of challenges, and technology is in the forefront of the profession. which force affects the current nurse most?

Which best describes a difference between cloning plants and selectively breeding plants? A. Cloning requires two parents and selective breeding requires one parent. B. Cloning results in a genetically identical plant and selective breeding does not.

A cook adds oil to vinegar and then mixes it to make a sald dressing. Is this a physical change? Why or why not?

Fossilized evidence of Earth's first forms of life would consist of a. vertebrates from the Precambrian b. invertebrates from the Precambrian c. eukaryotes from the Precambrian d. prokaryotes from the Precambrian

A) Chromosomes pair in step 2. B) Chromatids separate in step 5. C) Chromosomes are replicated in step 1. D) Chromosomes exchange genetic material in step 3.

The climate with which the monsoon forest is best associated with is