Fill in the blank with the best word to complete the sentence.

White blood cells protect against and aid in blood clotting when injuries are sustained.

Which of the following is a barrier against pathogens provided by the skin? high pH mucus tears desiccation

Which describes the location of Earth's biosphere, which includes all of Earth's living things? A. throughout the geosphere B. at the boundary of the geosphere and atmosphere, and throughout the hydrosphere C.

2. List types of cell transport.

The new york state index fossil valcouroceras is classified as a (1) coral (2) crinoid (3) eurypterid (4) nautiloid

How the nervous system coordinates the response of the skin to cold weather

What are two different habitats in a prairie ecosystem and name one organism found in each habitat.

Which level on the energy pyramid has the third most energy? A. primary producers B. primary consumers C. secondary consumers D. tertiary consumers

How do pH affect the stability of double-stranded nucleic acid?

What is the first step in the scientific process

Why is DDT so hazardous? A:it does not decompose fast B:it killed almost everything C: it traveled to many continents through water