Figure 4.1 is a graph showing changes in volume of air during Inspiration and expleation in the respiratory organs of a person.
a) Which letter shows the process of inspiration taking
place?
() Name the activities taking place during stages 1,2
and 3.
(b) Explain why there is an increase in volume during stage 3
(c) Describe four changes that will take place in the thorax
during inspiration in order to facilitate the increase in
volume during stage 2.
1.
2.
3.
4.
[Total:9)

The table below shows the number of foot bones in some horse fossils.horse fossil recordhorse fossil number of foot bonesp 19q 17r 24s 13ancient horses had more bones in their foot then present-day horses. the present-day horse has 11 foot bones. what is the correct order of evolution of the horse starting from the youngest fossil? a. q p r s b. s r p q c. s q p r d. r p q s

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a.the offspring are more likely to have freckles. b.the offspring are more likely to have no freckles. c.the likelihood of the offspring having freckles and not having freckles is the same. d.the likelihood of the offspring having freckles and not having freckles cannot be determined.

There are two tomato plantlets one of them is kept in an oxygen chamber with a light source and another is kept in sunlight. both of them are watered regularly what will be the observation after two weeks