Tree rings occur when _____

a. there are droughts during the time the rings form
b. environmental conditions influence xylem cell size
c. heartwood alternates with sapwood


B

Biology & Microbiology

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In the adaptive immune response, effective immunity cannot be detected for several days after the first contact with the pathogen

Indicate whether the statement is true or false.

Biology & Microbiology

Why is the process of peer review critical to scientific inquiry?

a. It protects scientists from being sued. b. It gives scientists a patent for their ideas and methods. c. It helps ensure that the research in a scientific paper is original, significant, logical, and thorough. d. It provides a venue where scientists can publish their materials and protocols for use by other scientists who want to do the same research.

Biology & Microbiology

An agent that can cause disease is a(n)

a. infectivore. b. protozoan. c. disruptor. d. pathogen. e. antibody..

Biology & Microbiology

Please select each of the common reservoirs of rabies listed below.

> Canines > Skunks, raccoons, and badgers > Birds > Bats > Reptiles

Biology & Microbiology