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1 a) What is a pathogen? 1 b) How do white blood cells help to defend the body against pathogens?

1 a) a microorganism that causes infectious disease 1 b) White blood cells: - Ingest pathogens - produce antibodies which destroy particular bacteria or viruses - produce antitoxins which counteract the toxi...
LB
Answered by Lauraa B. • Biology tutor
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When do I use the subjunctive in Spanish?

There are 2 moods in Spanish: the indicative, and the subjunctive. The indicative is used for anything that is concrete/ factual. For example: "Max habla español" (Max speaks Spanish). This is a fa...
MB
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25cm3 of NaOH (2M) were titrated with 1.25M H2SO4. Write down the balanced reaction equation. Calculate the number of moles of NaOH used in the titration and hence deduce the volume of sulfuric acid used in the titration. Give your answer in dm3.

2NaOH + H2SO4 -> 2H2O + Na2SO4. moles = concentration x volume. #moles NaOH = 2M x (25/1000)dm3 = 0.05 mol. The reaction equations shows the ratio of alkali to acid is 2:1. The number of moles of H2SO4 re...
TW
Answered by Tiffany W. • Chemistry tutor
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How to use properly conjunctions in a French essay?

In French we have two types of conjunctions. The coordination conjunctions link words or groups of words together using words such as: mais, où, et, donc, or, ni, car. They show union, consequences, conclusi...
RM
Answered by Roxane M. • French tutor
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Solve the following definite integral from x=2 to x=-1: ((x^4) + 3(x^2) + 2) dx

GENERAL PROCEDURE -- To solve this equation you can separate and integrate each term on its own and then add each integral together. To find the definite answer: Substitute "x=2" into the integrate...
HW
Answered by Harriet W. • Maths tutor
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