Correct Answer: B. email

Correct Answer: B. 2200J

Explanation

The work done in moving a charge across a potential difference is given by the formula W = QV, where W is the work done, Q is the charge and V is the potential difference. Substituting the given values, we get W = 10 C * 220 V = 2200 J. Hence, the work done is 2200 J.

Correct Answer: D. thyroxin

Correct Answer: C. Mali, Burkina Faso and Niger

Correct Answer: B) invisible

Explanation

This question is asking what determines the price of goods and services in a capitalist economy. The options provided are government, invisible, producer, and consumer. The correct answer is B, invisible.

In a capitalist economy, the price of goods and services is determined by the forces of supply and demand, which are sometimes referred to as the invisible hand. This means that prices are not set by the government or any other central authority, but rather by the interactions between producers, who supply goods and services, and consumers, who demand them.

When there is high demand for a product but limited supply, the price tends to go up. Conversely, when there is low demand but high supply, the price tends to go down. The invisible hand of the market helps to ensure that prices are determined fairly and efficiently, based on the needs and wants of both producers and consumers.

Therefore, Option B, invisible, is the correct answer to this question. It is important to note that while the government can influence prices through policies such as taxes and subsidies, ultimately it is the market forces of supply and demand that determine the prices in a capitalist economy.

Correct Answer: C. Government Reserved Area

Correct Answer: C. Khadijah

Explanation

(a)(i)Genes;are hereditary units/materials located on the chromosomes through which characters are transmitted from parents to offspring.

(ii) Gene mutation;is a spontaneous/sudden/unpredictable change in an individual gene which is persistent/ permanent/irreversible/heritable.

(b) The structures in plants and animals where mitosis and meiosis take place are listed below:

(i) Mitosis in plants: Root tip/stem apex; stem tip/ apex; cambium; meristems.

Mitosis in animals:Skin; damaged tissue; bone marrow; somatic cells/ wounded area of the body (e.g. skin).

(ii) Meiosis in plants:Ovaries; anthers.

Meiosis in animals: Ovaries; testes.

(c) Advantages of cross breeding two different breeds of cows are:

(i) Increased milk production.

(ii) Increased meat production/improved weight.

(iii) Resistance to diseases in the offspring.

(iv) Early maturity.

(v) Increased fecundity/reproductive capacity.

(d) Applications of genetics to medicine:

(i) Prevention of hereditary diseases.

(ii) Determination of the paternity of a child by use of DNN blood group.

(iii) Blood transfusion.

(iv) Production of insulin (to treat diabetes).

Correct Answer: A. quantity of goods

Correct Answer: D. They did not want to be defiled