Question about stars!
star distance from earth
alpha centauri 4.2 light years
barnard's star 6.0 light years
sirius 8.9 light years

the table above shows the distances to some of the nearest stars to our solar system. which of the following is true?
i. light from all three stars reaches earth in equal time.
ii. light from all three stars travels at the same speed.
iii. of the three stars, sirius is the farthest from earth.
iv. barnard's star is closer to earth than sirius is.

a. iii and iv only
b. ii, iii, and iv only
c. i and ii only
d. i, ii, iii, and iv

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.