Answer:
The unknown factor is temperature.
Temperature will be different on morning at noon and at night
Rate of carbon dioxide will be more at noon because temperature increases.
When Africa is given aid, a large portion of it is embezzled by the corrupt governments or dictators, leaving leaving little for the poor. Also, this enforces neocolonialism; African countries are forced to depend upon and follow the commands of the developed donors who give them aid. Furthermore, it causes inflation. The value of African currencies drops as more money is pumped into their economies through aid. Also, Africans need to earn money through working, and working will help Africa develop. Since aid is dumped into African countries, Africans and forced to become unemployed, lowering the chances of development in the future.
<u>Stromatolites are layered mounds of calcium carbonate that were deposited by algae during the Precambrian time.</u>
Answer: Option C
<u>Explanation:</u>
Stromatolites are the deposit of the layer which is mostly of limestone and these are mainly formed by the blue green algae which are only one celled organism of primitive times.
The features of these are that they are normally thin and have layers that might be either light or dark in color and are either flat or some of them even have a shape of a dome.
Answer:
There are three main types of variables in a scientific experiment: independent variables, which can be controlled or manipulated; dependent variables, which (we hope) are affected by our changes to the independent variables; and control variables, which must be held constant to ensure that we know that,A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.There are six common variable types:
DEPENDENT VARIABLES.
INDEPENDENT VARIABLES.
INTERVENING VARIABLES.
MODERATOR VARIABLES.
CONTROL VARIABLES.
EXTRANEOUS VARIABLES.
Variable of interest, in an experimental study, a changing quantity that is measured. One or more of these variables, referred to as the factors of the study, are controlled so that data may be obtained about how the factors influence another variable referred to as the response variable, or simply the response.