Question

1. Which of the following best describes trends in hominid evolution that took place over millions of years, from early ancestors to modern humans?

Their brain cavity increased in size, their overall body size decreased, and they became less reliant on vision.
Their jaw became more parabolic in shape, their gestation period increased, and they evolved to walk upright.
Their tooth size increased, their brain size decreased, and their hind limbs became longer.
Their overall body size decreased, their brow became lower, and their average litter size increased.

2. Premature babies have a good chance of surviving if they have developed for eight months, but they still can have problems at first. Which internal organ is most likely to give a baby problems if it is born before a full eight-month gestation period?

Brain
Lungs
Stomach
Heart

3. Read the quotation below:

Nature is messy. Science is tentative. As long as these truths remain relevant to biological research, scientific names will continue to be revised. –R. Aidan Martin

What does this quotation suggest about how a classification system needs to function to support modern science?

It needs to provide a strictly limited system to reduce confusion and disarray.
It must be flexible enough to adapt to new discoveries and still provide a meaningful framework.
It needs to loosely group similar organisms until all organisms are fully studied.
It must have enough categories to accommodate all future discoveries while retaining its original structure.

4. One way to classify organisms is by analyzing their genetic information to determine where they belong within a phylogenetic tree or cladogram. Which of the following best describes a complication of classifying bacteria based on genetic information?

The DNA mutation rate of bacteria cannot be tracked, unlike other organisms.

The DNA of bacteria is not made of the same nucleic acids as other organisms.

The DNA in one species of bacteria can be exchanged with an unlike species of bacteria.

The DNA of bacteria cannot be distinguished from the DNA of organisms they may use as a host.

5. A population of hummingbirds is composed of individuals with short or long beaks, which they use to reach nectar inside flowers. A flowering trumpet vine that produces many deep, bell-shaped flowers is introduced to the region, resulting in fewer short-beaked and more long-beaked hummingbirds. Which of the following conditions most likely caused this shift in the hummingbird population?

Hummingbird predators avoided areas where the trumpet vine grew.

Hummingbirds that compete for nectar were more successful with long beaks.

Hummingbirds with short beaks overproduced offspring with longer beaks.

Hummingbirds starved because the trumpet vine limited the food supply.

6. Which of the following best describes what would happen if the offspring of a fragrant, red rose bush produced flowers with no scent and small, pale petals?

The offspring would not cross-fertilize often with other roses.
The offspring would yield more fruit than the parent rose.
The offspring would lose its flowers and die from a lack of pollinators.
The offspring would produce seeds by asexual reproduction.

Answer 1

1. i think its Their brain cavity increased in size, their overall body size decreased, and they became less reliant on vision.

2. i think its lungs

3. i really have no idea

4. i think its The DNA of bacteria cannot be distinguished from the DNA of organisms they may use as a host.

5. Hummingbirds that compete for nectar were more successful with long beaks.

6. The offspring would lose its flowers and die from a lack of pollinators.

Answer 2

1 yep
2 yep, lungs are pretty much last organ to mature
3 i believe b: flexible (more of a grammar question than biol)
5 yes, more success with long beaks
6 yes,

Answer 3

@cheyennek Next time, try to post only 1 question at a time.