The pH scale measures the concentration of how acidic or basic something is. The lower the number below 7, is acidic. Above 7 is basic. 7 is waters purest form.
Answer:
B. often use tube feet to move around in their environment
Explanation:
Tube feet are tiny tubular projections of echinoderms on the underside (oral side). They are a member of the echinoderm water vascular system.
Tubular feet are used for feeding, breathing and shifting. They are arranged around the sides, in grooves. They work by hydraulic pressure. They are used to transfer food in the centre to the oral mouth, and may stick to surfaces. Tube feet allow certain animals to stick and travel slowly to the ocean floor. for example starfish uses tube feet for the above functions.
Hence, the correct option is B.
Answer:
Recombinant DNA
Explanation:
Recombinant DNA can be used to change the genetic makeup of a cell, as in adding a gene to make a bacterial cell produce insulin.
Answer: long bones
Explanation:
The long bones are the kind of bones which are slightly curved. These bones are curved this way these bones absorb the maximum external stress applied on the body from several points. They comprise of long, thin part that is called as the diaphysis, a shaft and two bulbous type ends that are called as the epiphysis. These consists of compact bones. These bones are hard, dense, and thus these bones provide the strength, mobility and structure to the body.