I think that all of the above are correct.
if you have to pick 1. i would suggest that you pick A.
dose this help?
The beta-lactam group of antibiotics such as penicillins (i.e. Amoxicillin), cephalosporins (i.e. Cefuroxime), and carbapenems (i.e. Meropenem) is the most widely used group of antibiotics. Beta-lactams are bactericidal. Beta-lactams have no innate resistance to beta-lactamases (enzymes produced by bacteria to break down beta-lactam antibiotics), but they can be paired with a beta-lacamase inhibitor such as Clavulanic acid. Later generations of beta-lactams may offer resistance to beta-lactamases. Beta-lactams offer activity against a broad spectrum of bacterial pathogens, including gram-positive, gram-negative, and (in higher doses, such as Cefazolin) anaerobic coverage.
Answer: Index fossils are used to identify layers of rocks. The layers will form an arrangement that relates to their age. In simpler terms, a layer that contains fossils are unique to that certain layer.
Index fossils are fossils that are mostly used by scientists due to it being easily found anywhere around the world and in abundant amounts. It can also be easily identified since they are fossils of widely varied organisms that lived during one short time period.
Answer:
a. Heterozygous individuals may pass on their copy of the disease-causing allele to offspring.
Explanation:
Tay-Sachs, which is a recessive lethal disease ---- Let say the recessive lethal diseases is s
∴ it only results when an individual posses two copies of the diseases-causing allele i.e two copies of the disease will be ss.
Now, when two hetrozygous individuals crossed , it is obvious that each can pass on their copy of the disease-causing allele to the offspring.
Let show an illustration for the above statement.
Let the heterozygous individual be Ts, if Ts cross with another Ts;
we will have:
Ts × Ts
T s
T TT Ts
s Ts ss
the offspring are TT,Ts,Ts,ss
We can now see how the Heterozygous individuals pass on their copy of the disease-causing allele to the offspring (Ts).
B) surface area and temperature
