Answer:
<em>Endoplasmic Reticulum, Mitochondria, Chloroplast, Golgi Apparatus</em>
All of these organelles are bounded by a double membrane...
Explanation:
Because dense minerals are heavier and drop to the stream bottom, lighter minerals are carried along in the current of the stream. Why do you think that mining on land is less costly than mining in the deep ocean is? It is easier to get to land than the ocean and you need special equipment to go under water.
Answer:
Although elephants and hyraxes at first don't seem to have many similarities, a closer look has led many scientists to believe that these animals are evolutionarily closely related.
Elephants and Hyraxes share many reproductive characteristics that indicate a common ancestor: The location of the testicules in these animals diverges from most mammalian species, remaining inside the retroperitoneal abdomen. Females have similar placental origins and long gestation periods and the location of the mammary glands in both orders (above the front legs) is a unique feature among non-primate mammals. Hyraxes' tusks develop from incisor teeth, similar to elephants, and in both cases nails develop into flattened, hoof-like structures.
Molecular evidence has also been used to confirm the hypothesis of evolutionary relatedness between the two orders, as similarities in some gene sequences in mitochondrial DNA and other molecular components. Both animals have some physiological similarities and cognitive characteristics (such as the presence of a powerful long-term memory) that support the possibility of evolutionary proximity.
The fossil record indicates that in the Eocene period hyraxes were dominant herbivores in Africa, with several species, reaching much larger sizes than today and occupying different ecological niches, indicating that elephants and hyraxes may have been very similar millions of years ago.
Answer: Option C
Explanation:
Phenylketonuria is a rare genetic disorder in which an amino acid known as phenylalanine to build up inside the body.
PKU is a disorder in which the there is a defect in the gene which helps in create the enzyme needed to breakdown the phenylalanine.
The level of phenylalanine in the individuals before birth is normal but after birth the concentration of the amino acid phenylalanine is abnormally high because the enzyme is not synthesized in the body that is responsible for its breakdown.
<span>
i think its A).Living organisms require a constant input of energy in order to maintain their chemical and physical organization.</span>
