Explain the evolution and the diversification of the early amniotes into contemporary reptiles. Use a phylogenetic tree to illustrate your answer.

How did black children experience enslavement? How were their lives and work different on a small plantation versus a large one?

P.S This is History subject

After watching "A world without microbes: An Apocalyptic Thought Experiment" video

1) What is the fundamental impact of microbes on this planet

2) Which two items discussed in the video impressed the most

• A picture of the crystal structure of Human P-type ATpase protein and a description of its 2°, 3° and 4° structure

What is the importance of the cell membrane in maintaining homeostasis ?

Can someone please, explain the different types of harsh habitat and the effect on this on our ecosystem.

Selection has favored large body size in male kangaroos because larger male kangaroos are better able to access females than smaller males. What type of selection is this?

Group of answer choices

Intrasexual

Both C & D

Stabilizing

Natural

Intersexual

In addition to C. elegans and Drosophila, Zebrafish are also another model organism - and have a spine. We're interested in two phenotypes, a curved spine and a gene that causes skin tumors to form on the fish's skin. We'd like to know if we could use the curved spine as an indicator if a fish may develop tumors (if the genes are linked). We'll assume that each of these traits is controlled by a single gene where:

a curved spine is the result of a dominant allele S (and a normal spine is the result of recessive alleles s),
and tumor growth is the result of a recessive allele t (and no tumor growths are a dominant T allele).

A testcross is performed with a fish that is heterozygous for both genes and the resulting progeny are given below.

TtSs x ttss

curved spine & tumors 18
curved spine & no tumors 23
normal spine & tumors 26
normal spine & no tumors 15

1. Assume for a moment that these genes are linked. If so, what allele combinations are parental in the TtSs genotype listed in the cross?

Are these two genes following Mendelian inheritance patterns? Use Chi-Squared analysis to test them. (X² = the sum of (o-e)²/e)

The Class Amphibia is divided in three living orders: Anura, Urodela and Gymnophiona. Provide a detailed account of 1) the typical life- cycle of an amphibian and 2) some specific patterns distinct to each order. You should make reference to reproduction, development and behaviour to structure your answer.

Jesse is interested in testing whether virus X causes disease in tomato plants. Her experimental design is to infect tomato plants from the green house with virus X and monitor for disease symptoms after 3 days, 1 week and 2 weeks. As a control Jesse will also monitor the tomato plants in her home garden, which she did not infect with virus X, at 3 days, 1 week and 2 weeks. Is this an appropriate control sample for Jesse’s experiment? Why?

Question 1

Nitrogen and phosphorus cycles differ in what ways? (CHECK ALL THAT APPLY)

-Nitrogen cycle dependent on bacteria

-Nitrogen cycle has an atmospheric component

-Phosphorus cycle has no atmospheric component

-Phosphorus enters food webs mainly through primary producers

Question 2

In terrestrial habitats species richness is negatively correlated with primary productivity

True or False

Question 3

Evapotranspiration shows a positive relationship with aboveground net primary productivity This is because

A. Evapotranspiration is the amount of water that must be exchanged for CO2

B. Evapotranspiration is negatively correlated with the number of open stomata

C. Evapotranspiration Is another way of measuring precipitation and precipitation provides the moisture plants need to grow

D.Evapotranspiration Is positively correlated with the number of open stomata and open stomata allow the plant to take in more CO2

E.Evapotranspiration is the term for CO2 absorption by leaves and plants need CO2 to create the products of photosynthesis

Examples of climate/ geography drives natural selection in humans.

Photosynthesis Light Reactions – Why is this like a battery?

parts of the spinal cord significance( function and importance) in the body