Answer:
1. Opposable thumbs are one of the characteristics of the primates that enhances their fitness. The thickest digit found in the hand is the thumbs that possess the tendency to rotate and move in distinct orientations in comparison to other digits. This makes the primates possess the tendency to hold the objects with the help of their hands in comparison to other animals that can only hold objects like food with the help of their mouth.
2. In case, if a primate infant fails to possess opposable thumbs, then it would become much tougher for him or her to pick the objects. With practice and time, the individuals would develop the habit of holding things with the help of other digits of the hand, however, the grasping power will not be that much or it can be said that such individuals would fail to exhibit strong grasping power.
Hypertonic is when the solution has a high concentration (high osmolarity), hypotonic is when the solution has a low concentration (low osmolarity) and isotonic is when the conditions are equal (same osmolarity). When in an hypotonic environment, a cell will take in water, causing it to swell
The number of covalent bonds that an atom tends to form is equal to the number of valence electrons.
Explanation:
Covalent bonds are formed between non-metals by sharing of the equal number of valence electrons between the two atoms. The valence electrons are the number of electrons in the outermost shell of the atom. These valence electrons share between the atoms and from bonds. eg. are NH3 and H2.
The sharing of valence electrons complete the octet rule and covalent bonds are formed.
<span>Quadriceps spindle is the receptor.
The patellar reflex is also called a knee-j erk reflex. In a knee-j erk reflex arc the sensory neuron directly connects to the motor neuron in the spinal cord. This is called a simple reflex arc. from the spindle to where it connects with the motor neuron in the spinal cord.</span>
