An element is characterized as having high density, luster, and being electrically conductive. To which class does this element belong?

In order for gas exchange to take place the alveoli must be closely associated with

Name two types of radiation that have an ionising effect on human tissue.

All cells are surrounded by a membrane. Which is a characteristic of a cell membrane? A) It is rigid B) It is semipermeable C) It is weak D) It is square

Alika finds a certain kind of butterfly near her house. She reads that ultraviolet light is absorbed by the butterfly's wings, red light is transmitted through the butterfly's wings, and green light is reflected off the butterfly's wings.

Which of the following has both endocrine and exocrine activity? the pituitary glands parathyroid glands the pancreas adrenal glands

1. An example of an organism that has an incomplete digestive system is a. a sea star. b. a sponge. c. a spider. d. a sand dollar.

Does eubacteria live in extreme or normal environment

A freshwater plant is placed in salt water. Which of the following events would most likely occur? Group of answer choices an increase in the action of its contractile vacuole shriveling of the cell swelling of the cell until it bursts swelling of

During what geological period do the angiosperms become more common?. A. Triassic. B. Permian. C. Jurassic. D. Cretaceous

Residential construction is expanding in Florida, the expansion has caused fragmentation of habitats, one of the results of the increased construction is a decrease in the number of large predators such as the coyote, black bear and pool panther,