biology 2 Flashcards
how much water is in the oceans
97%
WHAT PERCENT IS THE EARTHS WATER
Approximately 2.5% the total water is freshwater.
This is split into:
7% found in glaciers.
1% found in ground water.
8% found as permafrost.
4% as surface and atmospheric water.
Surface and atmosheric water consists of:
4% found in freshwater lakes.
2 found in soil residues.
5% found in the atmosphere.
5% in other wetlands.
6% found in rivers.
3% found in plants and animals.
what is the anatomy of a pufferfish
Tough, usually prickly skin.
Spines on the skin (especially in the spiny puffer).
Fused teeth that form a beak-like snout.
Elastic stomach area.
Short, stout, almost bloated appearance.
tetraodontidae is
Tetraodontidae is a family of primarily marine and estuarine fish of the order Tetraodontiformes. The family includes many familiar species variously called pufferfish, puffers, balloonfish, blowfish, blowers, blowies, bubblefish, globefish, swellfish, toadfish, toadies, toadle, honey toads, sugar toads, and sea squab.[1] They are morphologically similar to the closely related porcupinefish, which have large external spines (unlike the thinner, hidden spines of the Tetraodontidae, which are only visible when the fish have puffed up
ginglymostomatidae are
nurse sharks
Are grey nurse sharks aggressive?
Despite their appearance Grey Nurse Sharks are not a threat to divers or swimmers and actually have a very placid nature. The sharks have two large dorsal fins of similar size. The tail is distinctive as the top lobe is larger than the bottom
What is the lifespan of a nurse shark?
Maximum size about 9 feet. Matures at approximately 6 feet and is estimated to live 24+ years.
Are hammerhead sharks aggressive?
In general, hammerheads aren’t aggressive toward humans, although on rare occasions larger sharks have attacked people. (It’s possible that these sharks are a separate species, the great hammerhead, Sphyrna mokarran.) Their uncommonly small mouths are much better suited for eating fishes.
Are tiger sharks aggressive?
Tiger sharks can blend in only so much, though—their average length is around 14 feet, but they can be longer than 20 feet. Tiger sharks are known for being aggressive, and it’s true that they are second only to great whites in numbers of shark attacks on humans.
Can nurse sharks walk?
Nurse sharks are in-shore bottom dwellers, usually found swimming along the seafloor. They can also ‘walk’ using their pectoral fins as limbs. During the day, Nurse sharks can be found in groups of up to 40 individuals, laying together or stacked on top of each other.
Are mako sharks aggressive?
Shortfin mako sharks are aggressive predators that feed near the top of the food web on marine fishes such as bluefish, swordfish, tuna, marine mammals, and other sharks. They have few predators, mainly larger sharks that may prey on smaller shortfin mako sharks.
Is a bull shark aggressive?
They are an aggressive and territorial species, so it’s best to avoid bull sharks. However, since 2000, there have been only 27 unprovoked bull shark attacks on humans in the United States, with only one fatality.
