Sorry this is biology, i need asap !

1). in what direction do particles naturally diffuse?

a). up concentration gradients
b). down concentration gradients
c). across concentration gradients
d). thought concentration gradients

2). what is the main difference between active and passive transport?

a). active transport involves molecules of gases: passive transport involves the molecule of lipuids

b). active transport takes place in plant cells: passive transport takes place in animal cells

c). active transport takes place in the bloodstream: passive transport takes place in cells

d). active transport requires a cell to use energy: passive transport does not

3). the cell membrane is important for because it controls what enters and leaves the cell.

a). shape
b). pressure
c). homeostasis
d). temperature

Bakery has bought 250 pounds of muffin dough. they want to make waffles or muffins in half-dozen packs out of it. half a dozen of muffins requires 1 lb of dough and a pack of waffles uses 3/4 lb of dough. it take bakers 6 minutes to make a half-dozen of waffles and 3 minutes to make a half-dozen of muffins. their profit will be $1.50 on each pack of waffles and $2.00 on each pack of muffins. how many of each should they make to maximize profit, if they have just 20 hours to do everything?

Scoresby co. uses 6 machine hours and 2 direct labor hours to produce product x. it uses 8 machine hours and 16 direct labor hours to produce product y. scoresby's assembly and finishing departments have factory overhead rates of $240 per machine hour and $160 per direct labor hour, respectively. how much overhead cost will be charged to the two products? a. product x = $1,440; product y = $2,560 b. product x = $1,760; product y = $4,480 c. product x = $3,200; product y = $9,600 d. product x = $800; product y = $800

6. why the aggregate supply curve slopes upward in the short run in the short run, the quantity of output that firms supply can deviate from the natural level of output if the actual price level in the economy deviates from the expected price level. several theories explain how this might happen. for example, the misperceptions theory asserts that changes in the price level can temporarily mislead firms about what is happening to their output prices. consider a soybean farmer who expects a price level of 100 in the coming year. if the actual price level turns out to be 90, soybean prices will , and if the farmer mistakenly assumes that the price of soybeans declined relative to other prices of goods and services, she will respond by the quantity of soybeans supplied. if other producers in this economy mistake changes in the price level for changes in their relative prices, the unexpected decrease in the price level causes the quantity of output supplied to the natural level of output in the short run.