Robert has a tumor on his brain that requires radiation. Before his treatment, doctors perform a CT scan so they can know where to target the beam of radiation. Robert's head is shaved in that area and he receives a tiny circle tattoo to allow the radiation technicians to pinpoint the beam of radiation. What type of therapy is Robert receiving?
A. low-dose internal radiation therapy
B. external radiation therapy
C. high-dose internal radiation therapy
D. interstitial brachytherapy
E. chemotherapy
Answer: B
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All of the following are TRUE of adaptive
traits EXCEPT a. they allow individuals to adjust to the environment. b. they spread faster through populations of asexually reproducing organisms. c. they spread faster through populations of sexually reproducing organisms. d. variety results from mixing of the genetic traits. e. all of these are true
Which of the following phyla is unusual, as it is composed of a single species?
a. Gnetophtya
b. Anthophyta c. Ginkgophyta d. Coniferophyta e. Cycadophyta
Ecologist James H. Brown of the University of New Mexico has addressed species composition and richness in
experiments conducted since 1977 in the Chihuahuan desert of southeastern Arizona. In one experiment, the removal of three dominant species, all kangaroo rats, from several plots resulted in an increased diversity of other rodent species. This increase was ascribed both to lowered competition for food and also to an altered habitat, because the abundance of grass species ____ after the removal of the kangaroo rats. a. increased b. decreased c. did not change d. was threatened e. shrunk
9th week until birth
What will be an ideal response?