Which of the following describe membranes?
Check all that apply.
a structure that secretes substances through
a duct
a thin layer that separates or connects
structures inside the body
a structure that secretes hormones into the
bloodstream
a structure usually made from connective and
epithelial cells

B) A thin layer that separates or connects structures inside the body.

D) A structure usually made from connective and epithelial cells

Explanation: i did the test and got it right so this is the answer.

vote read

explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )