What differentiates sharks from whales? a. sharks have a dorsal fin and whales only have lateral flippers. b. sharks are toothed cetaceans and whales are baleen cetaceans. c. sharks can breathe underwater while whales have to surface to breathe. d. sharks eat fish and larger creatures while whales eat only krill. e. sharks have smooth skin while whales have scaly skin.

Option-(C):

"Sharks can breathe underwater while whales have to surface to breathe."

Explanation:

Sharks:

Sharks are cartilaginous forms of fish, and these species are living from over 400 millions in the water i.e oceans. As fish are characterized by folded openings on either side of its body. Due, to the system of gills present in the fish body's brings the specialty to the specie that it can collect or extract the amount of oxygen,O₂ from the water or environment in which it is present. As they are able to breath inside the water.

Whales:

Whales are mammals and obviously most of the mammals posses the lungs to breath. And for that reason whales needs to come over to the surface in order to breath. Because, oxygen can not be extracted or collected from the molecules present inside the water. Whales are more different in nature to the sharks.

a neutral ph of 7 and normal organism temperature is needed for a certain enzyme to be effective.  

what would happen to the enzyme if the ph and/or temperature fluctuate greatly from the norm?  

a.the enzyme’s hydrogen bonds will break.  

b.the activation energy will increase.  

c.more product will be formed.

d.the ideal temperature and ph for the enzyme function will decrease.  

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]