Question

use the information about kit fox ecology and your knowledge of science to answer the questions.
kit fox ecology
the san joaquin kit fox is a small fox, about the size of a house cat. it is native to the san joaquin valley, which is the southern part of california’s central valley. table 1 shows some characteristics of san joaquin kit foxes.
table 1. san joaquin kit fox characteristics
preferred habitat: deserts, open grasslands, prairies, scrub lands
size: about the size of a house cat
diet: small rodents, lizards, birds, insects
behavior: hunts at night; digs in soft soil to make underground dens
reproduction: two to six pups each year
predators: red foxes, coyotes, bobcats, raptors
other threats: habitat loss from human encroachment; use of pesticides and poisons
in the 1800s, the san joaquin valley of california was mostly open grassland and marshes with a few sparsely wooded areas. today, humans have changed much of the central valley for agricultural and urban use. figure 1 shows the results of a study about how a portion of fresno county in the central valley changed over time.

8
use the information in figure 1 to answer the questions.
part a
which claim about changes in biodiversity in the san joaquin valley is supported by the information in figure 1?
a biodiversity has decreased because a variety of habitats have been reduced.
b biodiversity has increased because of the expansion of agriculture.
c biodiversity has increased because woodlands have been removed.
d biodiversity has decreased because species have migrated out of the valley.
part b
which statement best explains why biodiversity is important for all life on earth?
a high biodiversity changes an ecosystem by reducing the survival rate of all but the individuals best suited to an area.
b low biodiversity results in stable ecosystems by increasing competition for resources among individuals.
c low biodiversity prevents the loss of species by increasing the types
(note: the ocr text may have some truncation due to image limitations, but the main question content is captured.)

Explanation:

Part A

To solve Part A, we analyze the habitat changes in the San Joaquin Valley. The text states that in the 1800s, the valley was mostly open grassland and marshes with sparse wooded areas, but today humans have changed much of it for agricultural and urban use. This habitat loss (from diverse natural habitats to agricultural/urban) would reduce biodiversity.

• Option A: Biodiversity decreased due to habitat loss (variety of habitats reduced) matches the context.
• Option B: Expansion of agriculture would likely reduce, not increase, biodiversity.
• Option C: Woodlands were sparse initially; removing them (if any) isn't the main change (main change is to agriculture/urban).
• Option D: Species migrating out isn't supported; the issue is habitat change in the valley, not migration out.

To solve Part B, we analyze each option:

• Option A: Biodiversity increasing survival of "all but best suited" is incorrect; biodiversity increases survival of more species, not reduce some.
• Option B: Low biodiversity would decrease competition? No, low biodiversity means fewer species, but competition within species or among few might not be stable. Also, stable ecosystems need high biodiversity.
• Option C: Low biodiversity preventing species loss? No, low biodiversity means fewer species, so it's more vulnerable to loss.
• Option D: High biodiversity changes ecosystems by reducing survival? No, high biodiversity increases survival by providing more niches, etc. Wait, re - evaluating: The correct logic is that biodiversity (high) increases the survival rate of species by having more varied traits, so when changes occur, some species (best suited) survive. Wait, no, let's re - check the options. Wait, the correct option is A? No, wait the original options:

Wait, the question is why biodiversity is important. Let's re - read the options:

A. High biodiversity changes an ecosystem by reducing the survival rate of all but the individuals best suited to an area. → No, biodiversity increases the chance that some species survive, not reduce survival of most.

B. Low biodiversity results in stable ecosystems by increasing competition for resources among individuals. → Low biodiversity means fewer species, competition among few might not stabilize; stable ecosystems need high biodiversity.

C. Low biodiversity prevents the loss of species by increasing the types of... Wait, the option was "Low biodiversity prevents the loss of species by increasing (the types..." No, low biodiversity has fewer species, so it's more likely to lose species.

Wait, maybe I made a mistake earlier. Let's re - analyze the options:

The correct reasoning for why biodiversity is important: Biodiversity (high) means more species, so when environmental changes happen, there's a higher chance that some species (with traits suited to the new environment) survive. So option A says "High biodiversity changes an ecosystem by reducing the survival rate of all but the individuals best suited to an area" → which means that in a biodiverse ecosystem, when changes occur, only the best - suited survive (so the ecosystem changes as species composition changes, but the best - suited survive). This is a way biodiversity helps: it has a variety of species, so when the environment changes, some (best suited) survive, allowing the ecosystem to adapt.

Wait, let's check the other options again:

Option B: Low biodiversity and stable ecosystems. Stable ecosystems need high biodiversity, so B is wrong.

Option C: Low biodiversity preventing species loss. No, low biodiversity has fewer species, so it's more vulnerable to loss.

Option D: Low biodiversity increasing competition? No, low biodiversity means fewer species, so competition among species is less.

So the correct option is A. Wait, no, maybe I messed up. Wait the option A: "High biodiversity changes an ecosystem by reducing the survival rate of all but the individuals best suited to an area." So in a biodiverse ecosystem, there are many species. When the environment changes, the individuals (species) that are best suited to the new environment survive, and the others have reduced survival. This means that the ecosystem can adapt to changes because there are species that are suited to the new conditions. So this explains why biodiversity is important: it allows ecosystems to adapt to changes, as there are species with differe…

Answer:

A. Biodiversity has decreased because a variety of habitats have been reduced.

Part B