Question 1
all living organisms contain carbon atoms. which of the following is an important characteristic of carbon?
question 1 options:
carbon atoms are highly reactive and form unstable bonds with any available atom.
carbon atoms can bond with any other atom, but they cannot form bonds with other carbon atoms
carbon atoms are very stable and do not easily form bonds with other atoms
carbon atoms can bond with many other kinds of atoms to form very stable molecules.
question 2
any chemical that contains carbon bonded to at least one other atom, usually hydrogen, is known as a
question 2 options:
carbohydrate
fatty acid
organic molecule
question 3
how many valence electrons are generally needed to fill the outer shell of most atoms?
question 3 options:
4
6
8
question 4
the macromolecules in biochemistry are proteins, carbohydrates, lipids and nucleic acids. what main elements do all of have in common?
question 4 options:
carbon and sulfur
carbon and hydrogen
oxygen and nitrogen
oxygen and phosphorus

Interpret the model. a three-part model with black right-arrows between the parts. left part: a large green apple-shaped component with a w-shaped indentation centered on top. a small blue apple-slice shape sits above the left indentation and an arrow points from the shape to the indentation. a small purple apple-slice shape and arrow sit above the right indentation and an arrow points from the shape to the indentation. middle part: a large green apple-shaped component with a square indentation centered on top. sitting in the left side of the indentation is a blue apple-slice shape with a flat bottom, fused to a purple apple-slice shape with a flat bottom on the right side of the indentation. right part: a large green apple-shaped component with a w-shaped indentation centered on top. an up-arrow is centered above the indentation pointing to a fused blue and purple apple-slice-shaped flat-bottom component sitting above the indentation. assigne "true" or "false" to the end of each statement. the model shows a shape change occurring in the enzyme after the substrate is bound in the active site. t/fthere are two products in this model. t? f there are three substrates in this model. t/f the model shows two different enzymes. t/f

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Time remaini 02: 50: 5 in the farewell speech, queen elizabeth's use of first-person point of view her to appear to be impartial and objective prevents her from addressing the audience directly allows her to share her personal thoughts and ideas, makes it seem as though she's observing from the outside, mack this and return save and evit