12. A group of elements that has two electrons in its outer energy level is the

a. alkaline earth metals

c. alkali metals

b. halogens

d. actinides

Discuss possible disturbances and their cause in an ecosystem

Which type of transport requires energy to move a molecule?

Having an extra chromosome results in bisomy monosomy polygamy trisomy

HCG is secreted in the human female immediately after conception. How would a gynecologist use this information? to detect pregnancy to detect abnormalities in the embryo to facilitate embryo implantation

How does the central vacuole contribute to the support of the plant?

Soaps, by themseives, are examples of a. surfactants. b. degerming agents. c. antiseptes d. both a and b.

What are the 3 care instructions for future life on earth

If many trees are removed from a forest by logging, what is themost immediate effect on the carbon cycle in that forest? A. increased rates of decomposition B. decreased rate of atmospheric CO2 C. decreased combustion of fossil fuels D.

How many of Earth's plant species are used as agricultural crops? A) 1,000 B) 3,000 C) 5,000 D) 7,000 E) 9,000

Dendrites are branching cytoplasmic projections of neurons that receive impulses and transmit them to the cell body. a. True b. False