An egg is protected by its outer shell. However, the shell also allows moisture and air to pass through. Which cell structure performs a similar function?

A:cell membrane

B:cytoplasm

C:nucleus

D:vacuole

What do plants release into the air during transpiration?

Earths crustal bedrock at the mid-Atlantic ridge is composed mostly of

The Earth's core is made of an alloy of A. iron and nickel. B. copper and iron. C. zinc and magnesium. D. iron and zinc.

what happens to the enzyme after an enzymatic reaction is complete? A) it loses a carbon atom B) it gains a water molecule C) it loses its hydrogen atom D) nothing happenes

Is chlamydia viral or bacterial? resons

12) DNA and RNA differ in all BUT one of the following ways. A) DNA is double-stranded, while RNA is single stranded. B) RNA uses the sugar ribose in its backbone, while DNA uses deoxyribose.

It contains two arteries and one vein entwined and enclosed by a protective, gristly substance called Wharton's Jelly. Blood constantly pulsates through it with every beat of your baby's heart. It is the A) villi. Eliminate B) placenta.

What happens when a baby did not recieve an X chromosome from either parent?

What happened in wwl

Mendel first crossed true-breeding plants to produce a second generation, which were then allowed to self-pollinate to generate the offspring. How do we name these three generations?