(a) Why did agriculture fail to develop in Zambia? (b) Why did agriculture develop successfully in Zimbabwe?

When a phylogenetic tree was constructed using comparisons of glucose-6-phosphate isomerase amino acid sequences from a wide variety of species including animals, plants, and bacteria, the bacterium E. coli was placed on a branch of the phylogenetic tree with a flower. What explanation could there be for this unusual association based on this one protein-coding sequence? (Recall that bacteria and plants are in very different locations on the evolutionary trees derived from analyses of several gene sequences or morphology and physiology.)

Granitic pebbles within a sedimentary rock have a radiometric age of 300 million years. What can you say about the age of the sedimentary rock? Nearby, a dike having a radiometric age of 200 million years intrudes into an outcrop of the same sedimentary rock. What can you say about the age of the sedimentary rock?

What are the correct preterite forms of the verbs? Luis y Mateo _____ (correr).

What is the de Broglie wavelength of a red blood cell with a mass of $1.00 \times 10 ^{-11}g$ that is moving with a speed of 0.400 cm/s? Do we need to be concerned with the wave nature of the blood cells when we describe the flow of blood in the body?

Let

$$g(x) = f^{-1}(x)$$

the inverse of function

$$f.$$

Write the rule for g for the function

$$f$$

given.

$$f(x) = 7^x$$

. Julián and his friends have fun around town. Choose the correct verb to complete each sentence.

1. Julián _____ muy contento del concierto

vuelves b. vuelve c. vuelvo d. volvemos

2. Claudia y Tomás _____ en el restaurante de la calle Madrid.

almorzamos b. almorzáis c. almuerzan d. almuerza

3. Pedro, Lucas y yo _____ ir al café a las 3:00 p.m.

puede b. pueden c. puedes d. podemos

4. Las entradas del cine _____ cinco euros.

cuesta b. cuestas c.cuesto d.cuestan

5. ¿Tú _____ a Laura en el parque?

encuentras b. encuentran c. encuentra d. encontráis

In a certain strain of turkeys, unfertilized eggs sometimes develop parthenogenetically to produce diploid offspring. (Females have ZW and males have ZZ sex chromosomes. Assume that WW cells are inviable.) What distribution of sexes would you expect to see among the parthenogenetic offspring according to each of the following models for how parthenogenesis occurs? a. The eggs develop without ever going through meiosis. b. The eggs go all the way through meiosis and then duplicate their chromosomes to become diploid. c. The eggs go through meiosis I, and the chromatids separate to create diploidy. d. The egg goes all the way through meiosis and then fuses at random with one of its three polar bodies (this assumes the first polar body goes through meiosis II).

How do time and convenience affect the food choices you make? Give two examples.

Factor each polynomial completely. If a polynomial cannot be factored, state that it is irreducible. $3 x ^ { 5 } + 12 x ^ { 4 } + 12 x ^ { 3 }$

In which case does an atom emit more energy (circle one)? Case A: An electron drops down from the first excited state to the ground state. Case B: An electron drops down from the third excited state to the ground state. Explain your reasoning.

It is projected that t years from now, the population of a certain town will be approximately P(t) thousand people, where $P(t)=\frac{100}{1+e^{-0.2 t}}.$ At what rate will the population be changing 10 years from now? At what percentage rate will the population be changing at that time?

The payoff matrices describe mixed-strategy games. Determine the optimal strategies for each game and the resulting value of the game.

$$\left[ \begin{array} {ccc} {4} & {9} \\ {10} & {3} \end{array} \right ]$$

What are the components of the Standard Model?