Question

When an organic compost pile is built correctly (sufficiently large, slightly moist, and containing a variety of organic material), it tends to get hot. Which of the following best explains why a compost pile gets hot?

Answer 1

Energy-containing organic molecules within the compost pile spontaneously break down and release their energy as heat.
Solar energy hitting the pile causes photosynthetic microorganisms in the pile to begin working and releasing the stored energy as heat.
The decomposers are breaking down energy-containing organic molecules for their own use and some of the energy escapes as heat.
The decomposers are constantly moving around within the compost pile and the friction of their motion heats up the pile.

Answer 2

The decomposers are breaking down energy-containing organic molecules for their own use and some of the energy escapes as heat.

Answer 3

Thank you so much!
and this one ?

Autotrophic organisms are able to take inorganic molecules and transform them into organic nourishment by using light or chemical energy. Why are autotrophic organisms considered essential to all other life on earth?
Answer
They are the primary producers at the base of the food chain.
They exist in smaller numbers as compared to heterotrophs.
They increase the atmospheric levels of carbon dioxide.
They use high levels of oxygen in their chemical reactions.

Answer 4

They are the primary producers at the base of the food chain.

Answer 5

What kind of bonding occurs between carbon atoms, allowing carbon to form stable molecules?
Answer
Single, double, and triple covalent bonds
Single, double, and triple hydrogen bonds
Single, double, and triple ionic bonds
Single, double, and triple metallic bonds

Answer 6

if u further need help ask @apoorvk he will help u i m leaving :)

Answer 7

@apoorvk
do you know this one!?
What kind of bonding occurs between carbon atoms, allowing carbon to form stable molecules?
Answer
Single, double, and triple covalent bonds
Single, double, and triple hydrogen bonds
Single, double, and triple ionic bonds
Single, double, and triple metallic bonds

Answer 8

carbon has 4 atoms in its valence shell, so donating electrons is very difficult for it. so is receiving. So, it shares its valence shell electrons, through covalent bonds!

and it can form, 1, 2 or 3 bonds with another carbon atom.

Answer 9

so which would the answer be?... sorry im horrible at biology :(!

Answer 10

well i provided all the information, read it!

(and this is more like chemistry btw :P)

Answer 11

so would it be a !?

Answer 12

yes right!

Answer 13

and this one!?

If a molecule contains two carbon atoms and four hydrogen atoms, what can you conclude about the bond between the carbon atoms?
Answer
It is a single bond.
It is a double bond.
It is a triple bond
It cannot bond.

Answer 14

now each carbon atom must have 4 bonds in total. now, each carbon atom here already has two single bonds hydrogen atoms, what bond would make it a total of 4 bonds for each carbon atom? think!

Answer 15

im not sure :( c?

Answer 16

or b!?