Answer:
1 and 6 are correct
Explanation:
1. A and B are probably closely related - true, as reflected by their close gene sequences which usually represents a very close genetic relationship
2. B and C are probably closely related - false, if their gene sequences are very different then they are probably not so closely related
3. A and C are probably closely related - false, we know A and B are close, and B and C are very different, therefore A is probably also very different
4. B is probably an outgroup while A and C are sister taxa - false, A and B are highly similar
5. A is probably an outgroup while B and C are sister taxa - false, B and C are very different genetically
6. C is probably an outgroup while A and B are sister taxa - true, we know A and B share similar gene sequences, whereas C is distinct.
Answer:
Option 2: Spiracles.
Explanation:
Cartilaginous fish (also called Chrondricytes) have a skeleton of cartilage, instead of bone. There are two subclasses - Elasmobranchii and Holocephali. Sharks, rays, skates and sawfish are elasmobranchs while chimeras are holocephali.
Here’s a list of features of cartilaginous fish in comparison to bony fish:
1. Cartilage skeleton: unlike bony fish that have a skeleton made of bones (just like other terrestrial vertebrates), the skeleton of cartilaginous fish is made of cartilage.
2. Spiracles: this is a modified gill of sorts, it aids with respiration and is found slightly behind each eye. It leads directly to the mouth. Most cartilaginous fish possess this organ (exceptions are present, such as hammerhead sharks). Bony fish do not possess spiracles.
3. Ampullae of Lorenzini: absent in bony fish, these organs are electroreceptors that form a network of pores filled with a form of jelly that can transmit electrical signals. It allows the cartilaginous fish to sense electric fields in the water (such as the movements of a fish struggling), magnetic fields and temperature. Some bony fish such as sturgeon and lungfish may possess these organs, however research is still ongoing.
4. Claspers: male cartilaginous fish possess an organ known as claspers at their pelvic fin. This is used during reproduction to transfer the sperm into the female for fertilisation. As such, internal fertilisation occurs in cartilagonous fish. Bony fish do not possess this organ, and external fertilisation occurs.
There are many other characteristics that differentiate cartilaginous fish from bony fish. They're an extremely fascinating group of animals that unfortunately, is decreasing in numbers. Very little is known about many of these animals, so it is important that we do our best to conserve the sharks, rays, sawfish and chimeras before we lose them forever.
The correct answer is triglycerides, this is the monomer that is made up
of gylcerol and one other molecule. The other molecule within the
monomer will depend on the use of the tryglycerde - for example, in
adipose tissue, tryglycerides are composed of one molecule of glycerol
and three moles of fatty acid.
Answer:
It is either A or D, im not sure what the bubbles represent either o2 or co2.
Explanation:
Answer: algae
Explanation:
Algae are found in water environment. It uses photosynthesis to produce its food from carbon dioxide in the atmosphere, also in the presence of sunlight.
Unlike other options, algae is the only producer in the food web
