Which one of the following best describes hormones?

The mean of ten numbers is 58. If one of the numbers is 40, what is the mean of the other nine?

75 g of freshly dug soil was placed in an oven at 105 ℃ for 24 hours. It was allowed to cool, then reweighed. If the final mass of the dry soil was 66 g, what was the % water content of the original soil sample?

All gas exchange surfaces in vertebrate animals have:

Which of the following does NOT contribute to unemployment?

Iron chloride can be prepared from the reaction of iron and:

Choose the ONE underlined part A, B or C that is inappropriate. If the sentence is acceptable as it stands, choose D.

We could reach the survivors neither by boat or by plane, and so we abandoned our search as futile.

Instructions: Choose from the four suggested answers the word which is closest to OPPOSITE in meaning to the underlined word.

As a result of the need for trained staff, the firm had to dismiss several workers.

__________ is a primary storage device that may be programmed and reprogrammed by the user.

In a food chain a plant is a producer because it produces:

Which of the following statements about lipids is NOT true?

An alternate form of a gene is called an:

The gross profit of a firm is $3,600, bad debts $100, rent paid $120, rent prepaid $20, general expenses $80 and discount received $110. The net profit is

The following are all minerals EXCEPT for:

To make car bodies we use:

Which of the following sets has a finite number of members?

The halogen, bromine, at room temperature is a:

Seeds are dispersed from the parent plant:

A species of mouse has 32 chromosomes in its muscle cells.What will be the numbers of chromosomes in the mouse′s skin cells and sperm cells?