Structure Test 4

Different hormones _____ at the same time on a particular target tissue.

• usually act

• usually acting

• they usual act

• the usual action

The tidal forces on the Earth due to _____ only 0.46 of those due to the Moon.

• the Sun is

• that Sun they are

• the Sun it is

• the Sun are

Most radioactive elements occur in igneous and metamorphic _____ fossils occur in sedimentary rocks.

• rocks, nearly all

• rocks, but nearly all

• rocks, nearly all are

• rocks, which nearly all are

_____ radioisotope is encountered, the first step in its identification is the determination of its half-life.

• An unknown

• Afterwards, an unknown

• When an unknown

• Until an unknown

The Missouri _____ longest river in the United States, flows through seven states from its source in Montana to its confluence with the Mississippi.

• River, the

• River is the

• River is one of the

• River, one of the

Coral islands such as the Maldives are the tips of reefs built during periods of warm climate, when _____ higher.

• were sea levels

• sea had levels

• having sea levels

• sea levels were

Hail forms within large, dense cumulonimbus _____ develop on hot, humid summer days.

• clouds

• clouds that

• clouds that are

• clouds that they

Measles is a highly contagious viral disease _____ by a characteristic skin rash.

• accompany

• is accompanied

• accompanied

• it is accompanied

Charles Darwin's first scientific book, published in 1842, _____ a since substantiated theory on the origin of coral reefs and atolls.

• to present

• presented

• presenting

• it presents

Phytoplanktons thrive where _____ phosphorus into the upper layers of a body of water.

• upwelling currents circulate

• the circulation of upwelling currents

• that upwelling currents

• circulates upwelling currents