Tracheids and vessels together make up

A. xylem.

B. phloem.

C. chloroplasts.

D. a plant cell.

A government agency collects health data of everyone living along the coast of the Gulf of Mexico. The rate of illness among the study group is compared to the general population. What type of experimental design is being used?

Movement of food from the stomach into the esophagus is usually prevented by

How does San Diego's proximity to water impact temperature?

Which of these factors best explains why liquid water exists on earth? a. weak salinity of earth's oceans b. earth's strong gravity c. presence of living things on earth d. freezing temperatures at earth's poles

Modern-day intensive crop production means the application of greater and greater amounts of nitrogen fertilizers. This is turn means more nitrogen in the atmosphere, which then leads to

A parent with freckles is crossed with a parent without freckles. The Punnett square shows the possible genotypes and phenotypes of the offspring. Which statement accurately describes the probability of phenotypes? A.

What is the basic buuildings block for all organisms

The nurse observes that 12 hours after birth the neonate is hyperactive and jittery, sneezes frequently, has a high-pitched cry, and is having difficulty suckling.

In humans red blood cells are primarily produced in the red marrow. To which body system does red marrow belong? A. integumentary system B. circulatory system C. muscular system D. skeletal system

Plaque consists of a biofilm, with bacteria carefully arranged in a community. what are the advantages of forming a biofilm?