Search results
The skull is dicondylic. The trunk is divided into thorax and abdomen. The mammals respire through lungs. Good sense of hearing as mammals are aided with 3 middle ear bones. Mammals have a four-chambered heart. The sinus venous and renal portal system are absent. Presence of single-boned lower jaws.
Here, Whales, Dolphins, and Seals are the animals belonging to Group Mammals. Explanation of the incorrect options: Option A: Seal and Dolphins are mammals, but shark belongs to a group of cartilaginous fishes. Option B: Dolphins and Seals are mammals, but Trygon is a stingray and belongs to Chondrichthyes. Option D:
Dolphin Scientific Name. Cetacea (Infraorder) Dolphins are aquatic mammals that fall under the parvorder Odontoceti, which includes porpoises and toothed whales such as sperm whales. Dolphins are widespread, with 40 recorded species. Members have streamlined bodies with hind limbs that are modified into flippers for propulsion.
Dolphins are aquatic mammals that are part of the Cetacea suborder of mammals. They are carnivores that eat other marine animals including fish, seals, whales, crustaceans, etc. Dolphins are also members of the chordate phylum. They exhibit playful behaviour and are one of the most intelligent creatures. Table of Contents. Orcas; Dolphin
Hence, it is not possible in dolphins and whales. Option D: Spiracles as the openings for breathing in arthropod, for example cockroach. They are the part of the tracheal system for respiration which is absent in mammals like dolphins and blue whales. Final answer: Whales and dolphins like fishes live in water. But they do not have gills.
These environments harbor numerous species of insects such as beetles, mayflies, stoneflies and several species of fishes including trout, eel, minnow, etc. Apart from these aquatic species, these ecosystems also include various mammals such as beavers, river dolphins and otters. Lentic Ecosystems; They include all standing water habitats.
Q. Identify the examples of convergent evolution from the following. (i) Flippers of penguins and dolpins. (ii) Eyes of octopus and mammals. (iii) Vertebrate brains. Q. Assertion :Analogous organs are a result of divergent evolution. Reason: Eyes of octopus and mammals depict divergent evolution. Q. Read the following three statements (i - iii ...
For example, Flippers of penguins and dolphins have different ancestors but have similar traits, commonly known as analogous structures. Penguins belong to Class Aves and dolphins belong to Class Mammalia. As flippers in both dolphins and penguins have the similar function of flippers. Another example is both bats and whales use echoes to find ...
In oviparous animals, fertilization takes place internally but embryo development takes place externally. The eggs of birds such as hen and duck carry immature embryo in them. The hard shells of eggs protect them from damage. Once the fetus is matured, the egg hatches. The trait of egg-laying animals is known as oviparity.
Analogous structures include those organs in different organisms that have different structures but apparently appear similar as they perform similar functions. Flippers of dolphins (mammals) and penguins (birds) have different internal structures (anatomy). They have different origins as well.
