Find the exact value of the expression.

sin (-15 degrees)

Which of the following structures is not found in bryophytes? a. a cellulose cell wall, b. chloroplast, c. sporangium, d. root.

Which of the following is thought to be the most closely related to the common animal ancestor? a. fungal cells, b. protist cells, c. plant cells, d. bacterial cells.

Which of the following organism is most likely to be a diploblast? a. sea star, b. shrimp, c. jellyfish, d. insect.

Which of the following is an abiotic factor?

A) penguins

C) soil bacteria

B) rain

D) redwood trees

Which of the following natural forces is responsible for the release of carbon dioxide and other atmospheric gases? a. the Milankovitch cycles, b. volcanoes, c. solar intensity, d. burning of fossil fuels.

Which type of animal maintains a constant internal body temperature? a. endotherm, b. ectotherm, c. coelomate, d. mesoderm.

Which of the following is not a feature common to most animals? a. development into a fixed body plan, b. asexual reproduction, c. specialized tissues, d. heterotrophic nutrient sourcing.

Which scientific concept did Charles Darwin and Alfred Wallace independently discover? a. mutation, b. natural selection, c. overbreeding, d. sexual reproduction.

Which type of feedback mechanism is required for maintenance of homeostasis?

What term describes the close association of a fungus with the root of a tree? a. a rhizoid, b. a lichen, c. a mycorrhiza, d. an endophyte.

Consulting the modern phylogenetic tree of animals, which of the following would not constitute a clade? a. deuterostomes, b. lophotrochozoans, c. Parazoa, d. Bilateria.

Which of the following statements about the fern life cycle is false? a. Sporangia produce haploid spores. b. The sporophyte grows from a gametophyte. c. The sporophyte is diploid and the gametophyte is haploid. d. Sporangia form on the underside of the gametophyte.

During embryonic development, unique cell layers develop and distinguish during a stage called ________.

A. the blastula stage;

B. the germ layer stage;

C. the gastrula stage;

D. the organogenesis stage.