Why do complex organisms need specialized cells?

Energy from the sun comes from fusion. what happens during this reaction

OverLord2011 [107]

Hydrogen atoms are compressed together by the enormous gravitational force of the sun, causing them to fuse int a helium atom (which is heavier than hydrogen), subatomic particles and enormous release of atomic energy. The attached picture shows the sequence of the main reaction at the core of the sun.

3 0

3 years ago

Meiosis reduces chromosome number and rearranges genetic information. Explain how the reduction and rearrangement are accomplish

Alisiya [41]

Answer:

Explanation:

Meiosis is a form of cell division that occurs in the sex cells of organisms. It ensures the reduction of a diploid cell to an haploid cell to allow for the formation of a diploid zygote after fertilization (contribution of both parents haploid sex cells to give a diploid zygote). Thus, this process is very essential and important.

The reduction is accomplished by 2 divisions after the duplication of chromosomes

- first division: separation of homologous pairs of chromosomes (this reduces the total in half)

- second division: separation of sister chromatids of a chromosome.

The rearrangement in meiosis occurs by crossing over/genetic recombination.

This is the exchange of genetic material between homologous pairs of chromosome bringing about a rearrangement and genetic variation

An example of a chromosomal abnormality that arises as a result of defects in this process is the Down Syndrome which is caused by a nondisjunction of the chromosomes 21 pair in a sex cell.

This condition produces offsprings that have some characteristic facial features, short stature etc

6 0

4 years ago

Lawrence Kohlberg built on the theories of _____ in his description of the stages of moral development. A. Carol Gilligan B. Jea

Ymorist [56]

Answer:

Lawrence Kohlberg build on the theories of Jean Piaget in his description of the stages of moral development.

Explanation:

The earlier work of Jean Piaget on cognitive development of children was expanded by Lawrence Kohlberg which he described in 6 stages.

1.Stage 1 : Obedience and punishment orientation

This is focused on children to obey rules and avoid from punishment.

2.Stage 2: Orientation through instruments

Individual should have to be in their best interest

3.Stage 3 : Good boy , nice girl orientation

The children will approve others and acts to avoid disapproval.Emphasis is placed on good and nice behavior.

4.Stage 4:Law and order orientation

The child will accept the rules of the society as rules are same for everyone.

5.Stage 5: Social contract orientation-

The world holds different opinions,right,and values and each will accept it mutually.

6. Stage 6: Universal ethical principal orientation-

It is based on abstract reasoning where ethical principles are used.

7 0

3 years ago

An adult female client describes the pain in her hand as having an audible grinding and cracking sound, especially in her thumb

slamgirl [31]

Answer: The correct answer to the question is option C

OSTEOARTHRITIS.

The client has a degenerative form of disease that is evidenced by osteoarthritis.

Explanation: Osteoporosis is otherwise known as degenerative joint disease.

In a healthy joint,a protective cartilage cushions the end of bones(articulating bones) and as well acting as a shock absorber.

In osteoarthritis,these cartilage that acts as a cushion to the bones wears down down or generates with time exposing the joint and the bones predisposing them to mild to moderate friction that occurs as a result of mobility of the bones/joint.

Osteoarthritis mostly affect joints of the hips, hands,spine and knees.

Some of the common symptoms of Osteoarthritis are;pain in the joints of the hands,knees,hips,lower back and neck with crackles,stiffness and tenderness of the joints which often results to difficulty in walking and deformity of the joint if left untreated.

7 0

4 years ago

The vaccine for chickenpox is: select one:

Alexxandr [17]

C. alive. The vaccine contains a live strain of varicella-zoster (chicken pox) virus which has been attenuated so that it will stimulates the immune system but does not cause any disease in healthy people.

5 0

3 years ago