help me with these biology questions?

Question

1. the challenges that faced early land plants included
a. conserving water
b. reproducing on land
c. absorbing minerals from the rocky surface
d. all of the above

2. some land plants developed an internal system of interconnected tubes and vessels called
a. cuticles
b. nonvascular canals
c. the circulatory system
d. vascular tissues

3. photosynthesis enables plants to produce most of the organic molecules that they need. this process requires the use of all of the following EXCEPT

4. removing a flowers stigma would initially affect
a. fertilization
b. seed production
c. pollination
d. seed dispersal

5. the conducting cells of phloem are called
a. tracheids
b. sieve tube cells
c. sieve plates
d. vessel cells

6. the cuticle
a. helps reduce the evaporation of fluids from a plant
b. is a plant adaptation to aquatic environment
c. in a reproductive structure in some plants
d. is crucial to plant cell nourishment

Answer 1

I think these are right:
1. D
2. D
3. ?
4. C
5. B
6. A

Answer 2

1 D. All parts are true.
2 D. vascular tissue. This vascular tissue is xylem and phloem.
3 Photosynthesis requires the use of chlorophyll in chloroplasts, light energy, water, and carbon dioxide.
4 C Pollination is the transfer of pollen from the anther to the stigma. So pollination is the first part that is affected.
5 B The cells of phloem are sieve tube cells or sieve tube elements.
6 A The cuticle is the waxy layer over plant parts that are exposed to the air. The cuticle helps hold down the amount of evaporation from parts of plants.

Answer 3

I don't think there is any way to conclusively prove the evolution theory at our current level of understanding. But I would say that there is a preponderance of evidence that supports it. But I think you only have to look around to see how other species have evolved. Penguins were once capable of flight, but their bodies have evolved to be better suited to swimming. You can go to almost any museum of natural history and see examples of the evolution of different species, including us. As climates changed and humans began to spread to more hostile environments, their bodies had to change to ensure survival. We are still evolving. Humans are, by and large, taller than they were 500 years ago. Some scientists say that, because we are now a global community, we will eventually become one race, encompassing the dominant characteristics of all of the races and ethnic groups that exist today. Some, like the Celts, have already disappeared into the melting pot. Or maybe it's simply all about change. Nothing stays the same. It's a Universal Truth that everything changes.